- What is the dimension for velocity?
(A) ML
(B) (ANS) LT-1
(C) MT
(D) L-2
(E) M3 L-1
- A car moving with a velocity of 20m/s at 30o to the horizontal, what is the components of the velocity along the horizontal
(A) (ANS) 17.3m/s
(B) 10m/s
(C) 20m/s
(D) 21m/s
(E) 34m/s - If a moving car X collides head–on with a moving car Y in the opposite direction, the conservation of momentum states that:
(A) the final momentum of X= final of Y
(B) total momentum of X and Y is reversed
(C) (ANS) total momentum of X and Y stays constant
(D) initial and final momentum of X is the same
(E) initial and final momentum of Y is the same
- A bullet of mass 20g travelling horizontally at 100m/s, embeds itself in the centre of a block of wood 1kg which is suspended by light vertical string 1m, calculate the velocity
(A) 51/100 m/s
(B) (ANS) 100/51 m/s
(C) 101/50 m/s
(D) 21/50 m/s
(E) 23/51 m/s - A car X moving of mass 500kg accelerates at 1ms-2 when the force due to engine is 600N
(A) 200N
(B) 300N
(C) 234N
(D) (ANS) 100N
(E) 600N
- Starting from rest a car of mass 1000kg accelerates steadily to 20m/s in 10 sec , what is the average power developed?
(A) 0.2kw
(B) 4.0kw
(C) 10kw
(D) 15kw
(E) (ANS) 20kw - A gun of mass 0.1kg has a bullet of mass 0.1kg , the bullet laves the piston when fired at a velocity of 200m/s , find the final velocity
(A) (ANS) 20m/s
(B) 23m/s
(C) 30m/s
(D) 45m/s
(E) 15m/s - Which of the following pairs has one vector and one scalar quantity?
(A) displacement, acceleration
(B) potential energy, work
(C) speed, power
(D) (ANS) kinetic energy, force
(E) velocity, momentum
- If p is the momentum of an object, then the expression P2/m has the same units as
(A) acceleration
(B) (ANS) Energy
(C) force
(D) impulse
(E) power
- A ship floating in clear water of density 1000kg moves to sea-water of density 1050kg where it floats, the upthrust on the ship then
(A) (ANS) stays constant
(B) decreases
(C) increases
(D) increases by 0.05 times
(E) decreases by 0.05 times - In Coloumb’s law, the force between two point charges is proportional to
1) the square of the distance between them
2) product of charges
3) permitivity of the medium
(A) 1nand 2
(B) 1and 3
(C) 2and 3
(D) 1only
(E) (ANS) 2 only
- If two equal charges each 1C were separated in air by distance of 1km, what would be the force between them
(A) 2KN
(B) 3KN
(C) (ANS) 9KN
(D) 10KN
(E) 4KN - Two positive point charges of 12µC and 8µC are 10cm apart, find the work done in bringing them 4cm closer that is they are 6cm. Take 1/4πϵϵo = 9×109 Mf-1
(A) (ANS) 5.8J
(B) 3.8J
(C) 4.8J
(D) 6.8J
(E) 2.8J - A steady current of 0.5A flows through a wire, how much charge passes through the wire in one minute?
(A) 32C
(B) 23C
(C) 45C
(D) 12C
(E) (ANS) 30C - The main evidence that light rays travel in a straight line is that
- Incident, reflected and the normal lie in the same plane,
- Pin-hole camera
- ecllipse of the sun
- Divergence of light rays
(A) 1 only
(B) 2. Only
(C) 3 only
(D) 3and 4 only
(E) (ANS) 1, 2, and 3 only
- Determine the potential difference between the ends of a wire of resistance 5Ω if 72oC passes through it per minute.
(A) 70V
(B) (ANS) 60V
(C) 65V
(D) 80V
(E) 85V - For an AC circuit at resonance it means:
(A) (ANS) XL = XC
(B) X=L
(C) R=C
(D) Z=R-C n
(E) R/C=0
- The image obtained with a converging lens is upright and three times the length of the object, if the focal length of the lrns is 20cm. Calculate the object distance
(A) (ANS) 13.3cm
(B) 40cm
(C) 33.1cm
(D) 40.3cm
(E) 34.9cm - Which of the followings are the characteristics of light rays:
1) reflection
2) refraction
3) dispersion
4) condition
5) chrominatioN
(A) 1 and 2
(B) 1 and 3
(C) 2 and 3
(D) (ANS) 1, 2 and 3
(E) 3, 4 and 5
- The two commonly used lenses in an Astronomical telescope are:
(A) objective, diverging
(B) eye-piece, covering
(C) (ANS) objective, eye-piece
(D) objective, converging
(E) None
- In dispersion of light rays which is odd out of followings:
- It involves separation of colours
- Separation is due to differences in speeds
- All colours travel with the same speed in vacuum
- no speed is involved
(A) 1 only
(B) 2 only
(C) 3only
(D) 1, 2, 3and 4only
(E) (ANS) 1,2 and 3
- Sound waves and light waves cannot both be
(A) refracted
(B) reflected
(C) made to produce an interference
(D) (ANS) polarised
(E) diffracted
- Which of the statements below are correct about threshold wavelength of a metal
- increases with frequency of light
- decreases with frequency of light
- Increases with light intensity
(A) 1 only
(B) 2 only
(C) 3 only
(D) 1, 2 and3only
(E) (ANS) None of the above
- A ball is projected from the ground at an angle of 30o with the horizontal at an initial speed of 40 ms-1. Ignoring air friction, calculate the time it will take the ball to strike the ground. (Take acceleration due to gravity g = 10 ms-2).
(A) 2 s
(B) 3 s
(C) 4 s
(D) 5 s
- Light of wavelength 450nm is shone on to the surface of a metal of work function 3.2×10-19J, the maximum energy of emitted electron in 10-19J is.
(A) 0.8
(B) (ANS) 1.2
(C) 2.4
(D) 2.8
(E) 3.2 - A woman weighs 500 N and stand on a weighing balance in an elevator. If the elevator accelerates downwards at 1.2 ms-2, the reading of the balance is [g = 10 ms-2
(A) 400 N
(B) (ANS) 440 N
(C) 540 N
(D) 600 N - The type of radiation that does not have effect with electric or magnetic field is
(A) (ANS) gamma rays
(B) beta particles
(C) Alpha particles
(D) hydrogen
(E) Ceaseium
- How much water at 0oC is needed to cool 0.5 kg of water at 80oC down 20oC?
(A) 1.0 kg
(B) (ANS) 1.5 kg
(C) 2.0 kg
(D) 2.5 kg
- The electromagnetic radiation with the strongest penetrating power is
(A) Ceaseium
(B) beta particles
(C) Alpha particles
(D) hydrogen
(E) (ANS) gamma rays
- A ball is dropped from a roof at the same time as another ball is thrown upward from the roof.
The two balls
(A) Have the same velocity when they reach the ground
(B) (ANS) Have the same acceleration when they reach the ground
(C) Reach the ground at the same time
(D) Reach the ground at the same time
(E) None of the above
- Which of the following particle is more strongly affected by magnetic field
(A) Apha
(B) (ANS) beta
(C) gamma
(D) X-rays
- A stone thrown upward has and acceleration that is
(A) smaller than that of a stone thrown downward
(B) (ANS) the same as that of the stone thrown downward
(C) Greater than that of a stone thrown downward
(D) Zero until it reaches the highest point in its path
(E) None of the above
- A car towing a trailer is accelerating on a level road. The car exerts a force on the trailer whose magnitude is
(A) (ANS) the same as that of the force the trailer exerts on the car
(B) The same as that of the force the trailer exerts on the road
(C) the same as that of the force the road exerts on the trailer
(D) greater than that of the force the trailer exerts on the car
(E) None of the above - A solenoid has 2000 turns on its 40cm length. What is the magnetic field intensity at its centre if it carries a current of 5A?
(A) 0.314A
(B) 3.14A
(C) (ANS) 0.0314A
(D) 314A
(E) 31.4A - How long does a bicycle with an acceleration of 0.8m/s2 take to go from 4 to 12m/s?
(A) 6.4s
(B) (ANS) 10s
(C) 15s
(D) 26s
(E) None of the above
- A household refrigerator consumes electrical energy at the rate of 200W if the electricity cost 5k per kWh; calculate the cost (in naira) of operating the appliances for 30 days.
(A) (ANS) 7.20
(B) 12.00
(C) 30.00
(D) 33.33
(E) 72.00
- A stone is dropped from the top of a tall building and at the same time, another stone is thrown vertically upwards from the ground level with a velocity of 20m/s. The stones meet exactly 2s after their release. How tall is the building?
(A) 50m
(B) 60m
(C) 70m
(D) (ANS) 40m
(E) None of the above - The resistivity of a metal such as copper increases with increasing temperature because
(A) the conduction electrons make more frequent collisions with each other
(B) (ANS) the conduction electrons make more frequent collisions with the atoms of the metal
(C) the metal expands and offers more resistance to the flow of electrons
(D) it is more difficult to cause electrons to leave their parent atom
(E) the positive ions in the metal undergo more collisions with neutral atoms
- At what respective values of x, y and z would the Newton’s be dimensionally equivalent to MxLyTz
(A) -1, 1, 2
(B) 1, -1, 2
(C) (ANS) 1, 1,-2
(D) -1, -1, -2
- A particle of charge q and mass m moving with a velocity v enters a uniform magnetic field B in the direction of the field. The force on the particle is
(A) (ANS) Bqv
(B) Bqmv
(C) Bqv/m
(D) Bmv/q
(E) mv/Bq - For which of the under listed quantities is the derived ML2T-2 correct?
I. Moment of a force
II. Work
III. Acceleration
(A) I only
(B) (ANS) II only
(C) III only
(D) I and II
- A negatively charged rod is brought near the cap of an electroscope. The cap is earthed momentarily while the charge is near to it. The rod is then removed. Which statement is correct?
(A) The cap will be positively charged and the leaf will be negatively charged
(B) The cap will be negatively charged and the leaf will be positively charged
(C) (ANS) The cap and the leaf will be positively charged
(D) The cap and the leaf will be negatively charged
(E) The cap and the leaf will become not charged
- If a source emits light at a frequency of 7 x 1014 Hz and the Planck’s constant h = 6.6 x 10-34, the energy of one photon of this light is approximately equal to
(A) 1 x 10-48J
(B) (ANS) 4 x 10-19J
(C) 1J
(D) 4.6 x 1010J
(E) 4.6 x 1019J - A 2µF capacitor is charged to a potential of 200V and then isolated. When it is connected in parallel with a second capacitor which was initially not charged, the common potential becomes 40V. The capacitance of the second capacitor is
(A) 2 µF
(B) 4 µF
(C) 6 µF
(D) (ANS) 8 µF
(E) 16 µF - A radioactive nuclide of proton number X emits a ß-particle to form a new nuclide of proton number Y. the correct equation relating X and Y is
(A) (ANS) X = Y – 1
(B) X = Y – 1
(C) X = 1 – Y
(D) X = 1/Y
(E) X = Y - A proton charge 1.6 x 10-19C is projected into a uniform magnetic field of flux density 5.0 x 10-5T.
If the proton moves parallel to the field with a constant speed of 1.6×106 ms-1, calculate the magnitude of the force exerted on it by the field.
(A) (ANS) 0.0N
(B) 2.0 x 10-21N
(C) 1.3 x 10-17N
(D) 5.1 x 10-14N
(E) 2.3 x 10-13N - A capacitor has a capacitance of 8µF with vacuum between its plates. Calculate the capacitance when a dielectric with dielectric constant 5.0 is placed between its plates.
(A) 2 µC
(B) 4µF
(C) (ANS) 40 µF
(D) 50 µF
(E) none of the above
- How long does a bicycle with an acceleration of 0.8m/s2 take to go from 4 to 12m/s?
(A) 6.4s
(B) (ANS) 10s
(C) 15s
(D) 26s
(E) None of the above
- A force of 200N acts at an angle of 140o with respect to the positive x-direction. What are the components of this force in the x and y direction.
(A) (ANS) -1540N, 1280N
(B) -1500N, 2010N
C)-1280N, 1540N
(D) -1450N, 1200N
(E) None of the above - A car towing a trailer is accelerating on a level road. The car exerts a force on the trailer whose magnitude is
(A) (ANS) the same as that of the force the trailer exerts on the car (ANS)
(B) The same as that of the force the trailer exerts on the road
(C) the same as that of the force the road exerts on the trailer
(D) greater than that of the force the trailer exerts on the car
(E) None of the above
PRACTICE 2
Question 1
The limiting frictional force between two surface depends on
I. the normal reaction between the surfaces
II. the area of surface in contact
III. the relative velocity between the surfaces
IV. the nature of the surface
Options
A) I only
B) I and IV only
C) II only
D) III only
The correct answer is B.
Explanation:
- Friction depends on the nature of the surfaces in contact
- Solid friction is independent of the area of the surfaces in contact and the relative velocity between the surfaces.
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Question 2
If a body moves with a constant speed and at the same time undergoes an acceleration, its motion is said to be
Options
A) oscillation
B) circular
C) rotational
D) rectilinear
The correct answer is B.
Explanation:
Circular motion has uniform
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Question 3
When blue and green colours of light are mixed, the resultant colour is
Options
A) cyan
B) magenta
C) black
D) yellow
The correct answer is A.
Explanation:
Cyan is a bluish-green colour
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Question 4
A metal rod has a length of 100cm at 200oCoC. At what temperature will its length be 99.4cm. If the linear expansivity of the material of the rod is 2 ×× 10−5C−1−5C−1
Options
A) 200ooC
B) 300ooC
C) 100ooC
D) -100ooC
The correct answer is D.
Explanation:
L11 = 100cm, T11 = 200ooC
L22 = 99.4cm,T22 = ?
αα = 2 x 10−5−5C−1−1
αα = L2−L1L1(T2−T1)L2−L1L1(T2−T1)
2 x 10−5=100−99.4100(200−T2)=0.6100(200−T2)−5=100−99.4100(200−T2)=0.6100(200−T2)
2 x 10−5−5 x 100(200−T2)=0.6100(200−T2)=0.6
200−T2=0.60.002=300oC200−T2=0.60.002=300oC
T2=200−300=−100oCT2=200−300=−100oC
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Question 5
According to kinetic molecular model, in gases
Options
A) The molecules are very fast apart and occupy all the space made available.
B) The particles occur in clusters with molecules slightly farther apart.
C) The particles are closely packed together, they occupy minimum space and are usually arranged in a regular pattern.
D) The particles vibrate about fixed positions and are held together by the strong inter-molecular bond between them.
The correct answer is A.
Explanation:
In kinetic molecular model, gases are energised and thus moves freely, fast as they occupy specific space
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Question 6
The value of T in the figure above is
Options
A) 30N
B) 10.0N
C) 20N
D) 40N
The correct answer is D.
Explanation:
Tsin30 + Tsin30 =40
2Tsin30 = 40
Tsin30 = 40/2 = 20
T(1212) = 20
T = 20 x 2 = 40N
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Question 7
A train has an initial velocity of 44m/s and an acceleration of -4m/s22. Calculate its velocity after 10 seconds
Options
A) 10m/s
B) 6m/s
C) 8m/s
D) 4m/s
The correct answer is D.
Explanation:
V = u _ at, at u = 44m/s
44 + [-410
4m/s
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Question 8
Lamps in domestic lightings are usually in
Options
A) series
B) divergent
C) convergent
D) parallel
The correct answer is D.
Explanation:
Lamps in lightenings are arranged to reduce the heat losses
- resultant resistance is small for parallel arrangement which indicate low heat losses [Heat αα R
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Question 9
During the transformation of matter from the solid to the liquid state, the heat supplied does not produce temperature increase because
Options
A) all the heat is used to break the bonds holding the molecules of the solid together
B) the heat capacity has become very large as the substance melts
C) the heat energy is quickly conducted away
D) the heat gained is equal to the heat lost by the substance
The correct answer is A.
Explanation:
During the transformation of the matter from the solid to the liquid state, the heat supplied does not produce a temperature increase because all the heat is used to break the bonds holding the molecules of the solid together
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Question 10
In a slide wire bridge, the balance is obtained at a point 25cm from one end of wire 1m long. The resistance to be tested is connected to that end and a standard resistance of 3.6ΩΩ is connected to the other end of the wire. Determine the value of the unknown resistance
Options
A) 3.2ΩΩ
B) 1.4ΩΩ
C) 3.21ΩΩ
D) 1.2ΩΩ
The correct answer is D.
Explanation:
R3.6=7525=13R3.6=7525=13
3R = 3.6
R = 1.2Ω
Question 11
Electrons were discovered by
Options
A) Dalton
B) James Charwick
C) J.J. Thompson
D) Niels Bohr
The correct answer is C.
Explanation:
Electron was discovered J.J Thompson in 1879
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Question 12
Which of the following is/are the limitations to the Rutherford’s atomic models?
I. It is applicable when energy is radiated as electrons are revolving
II. It is applicable when energy is radiated in a continuous mode
III. It is applicable to an atom with only one electron in the other shell
Options
A) I only
B) II only
C) I and II only
D) I, II and III only
The correct answer is C.
Explanation:
Rutherford assumed that (I) energy is radiated when electrons are revolving (II) energy is radiated in a continuous mode. These are limitations of Rutherford’s model
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Question 13
Which of the following equations is the correct definition of the reactance of an indicator L?
Options
A) Reactance = (Amplitude of voltage) ÷÷ (Amplitude of current)
B) Reactance = (Amplitude of voltage) x (Amplitude of current)
C) Reactance = (Amplitude of current)22 ÷÷ (Amplitude of voltage)
D) Reactance = (Amplitude of current)22 ÷÷ (Amplitude of voltage)1212
The correct answer is A.
Explanation:
Reactance is the value of an indicator or a capacitor in ohms
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Question 14
Ripple in a power supply unit is caused by
Options
A) using an alternating current source
B) forward voltage drop
C) heavy load
D) using a zener diode
The correct answer is D.
Explanation:
The correct option is “Using a zener diode” as fluctuation of d.c signal results from the rectification of a.c to d.c.
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Question 15
When the temperature of a liquid is increased, its surface tension
Options
A) increases
B) decreases
C) remain constant
D) increases then decreases
The correct answer is B.
Explanation:
Surface tension or elasticity of a fluid decreases with increased in temperature
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Question 16
The distance between an object and its real image in a convex lens is 40cm. If the magnification of the image is 3, calculate the focal length of the lens
Options
A) 6.5 cm
B) 7.5 cm
C) 8.5 cm
D) 4.5 cm
The correct answer is B.
Explanation:
u + v = 40
vuvu = 3
v = 3u
u + 3u = 40
4u = 40
u = 10cm
v = 3u = 30cm
f = uvu+v=10(30)10+30=30040uvu+v=10(30)10+30=30040
= 7.5 cm
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Question 17
A ray of light passes through the centre of curvature of a concave mirror and strikes the mirror. At what angle is the ray reflected?
Options
A) 180oo
B) 90oo
C) 0oo
D) 60oo
The correct answer is C.
Explanation:
- a ray of light passing through the centre of a curvature is returned along the same path
- angle difference along the same path is zero
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Question 18
The pin-hole camera produces a less sharply defined image when the
Options
A) pin-hole is larger
B) illumination is less
C) screen is further from the pin-hole
D) object is further from the pin-hole
The correct answer is A.
Explanation: - a less sharp or blurred image is due to increased brightness
- increase brightness is also due to large hole or many pin holes
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Question 19
A straight wire 15cm long, carrying a current of 6.0A is in a uniform field of 0.40T. What is the force on the wire when it is at right angle to the field
Options
A) 0.46N
B) 0.35N
C) 0.36N
D) 0,24N
The correct answer is C.
Explanation:
F = BIL = 0.4 x 6 x 1510015100
= 0.36N
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Question 20
The pitch of a screw jack is 0.45cm and the arm is 60cm long. If the efficiency of the Jack is 75/π %, calculate the mechanical advantage.
Options
A) 400
B) 300
C) 200
D) 150
The correct answer is C.
Explanation:
P = 0.45cm, L = 60cm, Eff = 75/π%
VR (Screw system) = 2πr
__________________________________P = 2πL ________________________________________P M.A = Eff% × VR ________________________________________100 = 75 __________________________________π × 1
________________________________________100 × 2π × 60
________________________________________0.45 = 75 × 800
________________________________________300 = 200
Question 21
When the downward current flows in a straight vertical conductor, the direction of its magnetic field at a point due north of the wire is
Options
A) Upward
B) North
C) South
D) West
The correct answer is D.
Explanation:
At a point due N of the wire, the field is due east, at a point due S of the wire, the field is due west.
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Question 22
Aluminium is sometimes used as the leaf of an electroscope because it
Options
A) is a light material
B) is a good conductor
C) is a good insulator
D) can be converted into thin sheets
The correct answer is D.
Explanation:
- Aluminium can be made in thin sheet like Gold.
- the leaf is a thin material that can be diverged easily.
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Question 23
The diagram above represents the stress-strain graph of a loaded wire. Which of these statements is correct?
Options
A) At J, the wire becomes plastic
B) J is the yield point
C) L is the elastic limit
D) At K, the wire breaks
The correct answer is B.
Explanation:
- I is the elastic limit
- the end of the constant part J is the yield point
- L is the break point.
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Question 24
A supply of 400V is connected across capacitors of 3μf and 6μf in series. Calculate the charge
Options
A) 8 x 10−4−4C
B) 4 x 10−2−2C
C) 8 x 10−3−3C
D) 4 x 10−8−8C
The correct answer is A.
Explanation:
CTT = C11 × C22
________________________________________C11 + C22
= 3 × 6
________________________________________3 + 6
= 189189 = 2μf
Q = CV
⇒ 2 × 10−6−6 × 400
⇒ 800 × 10−6−6C = 8 × 10−4−4C
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Question 25
A vibrator causes water ripples to travel across the surface of a tank. The wave travels 50cm in 2s and the distance between successive crests is 5cm. Calculate the frequency of the vibrator
Options
A) 5Hz
B) 6Hz
C) 5.2Hz
D) 25Hz
The correct answer is A.
Explanation:
V=DistancetimeV=Distancetime
= 50cm2s50cm2s
= 25 cms−1−1.
V=fλV=fλ
f=Vλf=Vλ
f=255f=255
= 5 Hz
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Question 26
A thermocouple thermometer is connected to a millivoltmeter which can read up to 10mV. When one junction is in ice at 0°C and the other is steam at 100°C, the millivoltmeter reads 4mV. What is the maximum temperature which this arrangement can measure
Options
A) 100ooC
B) 248ooC
C) 250ooC
D) 350ooC
The correct answer is C.
Explanation:
tθθ – too = 10,
t100100 – too = 4
θ = tθθ – too
________________________________________t100100 – too × 100
10
________________________________________4 × 100 = 250°C
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Question 27
An alternating current can induce voltage because it has
Options
A) ripple value
B) varying magnetic field
C) weaker magnetic field than direct current
D) high peak value
The correct answer is B.
Explanation:
As induced voltage is produced by varying magnetic field. The induced voltage is proportional to the rate of change of magnetic flux linking the coil.
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Question 28
The limiting frictional force between two surfaces depends on
I. the normal reaction between the surfaces
II. the area of surface in contact
III. the relative velocity between the surfaces
IV. the nature of the surfaces
Options
A) I only
B) II only
C) III only
D) I and IV only
The correct answer is D.
Explanation:
- Friction depends on the nature of the surfaces in contact
- Solid friction is independent of the area of the surfaces in contact and the relative velocity between the surfaces.
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Question 29
During the transformation of matter from the solid to the liquid state, the heat supplied does not produce a temperature increase because
Options
A) the heat energy is quickly conducted away
B) the heat capacity has become very large as the substance melts
C) the heat gained is equal to the heat lost by the substance
D) all the heat is used to break the bonds holding the molecules of the solid together
The correct answer is D.
Explanation:
During the transformation of matter from the solid to the liquid state, the heat supplied does not produce a temperature increase because all the heat is used to break the bonds holding the molecules of the solid together
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Question 30
The statement ‘Heat lost by the hot body equals that gained by the cold one’ is assumed when determining specific that heat capacity by the method of mixtures. Which of the following validates the assumption?
I. Lagging the Calorimeter
II. Ensuring that only S.I units are used
III. Weighing the calorimeter, the lid and the stirrer.
Options
A) I only
B) I and II only
C) I and III only
D) II and III only
The correct answer is C.
Explanation:
I and III only as units are independent of energy equation.
Question 31
In the molecular explanation of conduction, heat is transferred by the
Options
A) Free electrons
B) Free atoms
C) Free molecules
D) Free solids
The correct answer is A.
Explanation:
- Conduction is explained in terms of the free electrons.
- Convention is explained in terms of the movement of the fluid involved.
- Radiation is explained in terms of invisible electromagnetic wave
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Question 32
The conductivity of gases at low pressure can be termed as
I. hot cathode emission
II. thermo ionic emission
III. cold cathode emission
IV. Field emission
Options
A) I and II
B) II and III
C) III and IV
D) IV and V
The correct answer is C.
Explanation:
As conduction of gases is at low pressure and high voltage, called field or cold cathode emission.
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Question 33
Which of the following media allow the transmission of sound waves through them?
I. air
II. liquid
III. solids
Options
A) I and II only
B) I and III only
C) II and III only
D) I, II and III
The correct answer is D.
Explanation:
- sound travels through solids, liquids and gases
- sound travels faster in solid than in liquid and faster in liquid than in gases.
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Question 34
The earth’s gravitational field intensity at its surface is about
(G = 6.7 × 10−11−11Nm22/kg22, mass of the earth is 6 × 102424kg, radius of the earth is 6.4 × 1066m, g on the earth = 9.8m/s22)
Options
A) 6.7N/kg
B) 7.9N/kg
C) 8.0N/kg
D) 9.8N/kg
The correct answer is D.
Explanation:
E = F
__________________________________m = GMm/d22 ________________________________________m = GM ________________________________________d22 E = 6.7 × 10−11−11 × 6 × 102424 __________________________________(6.4 × 1066)22 = 9.8N
________________________________________kg
E = g = 9.8N/kg
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Question 35
The following are parts of the eye
I. Retina
II. Pupil
III. Iris
The correct equivalent in the camera in the same order are
Options
A) Diaphragm, Aperture, film
B) Aperture, Diaphragm, Film
C) Film, Diaphragm, Aperture
D) Film, Aperture, Diaphragm
The correct answer is D.
Explanation: - retina is similar to film
- pupil is similar to aperture
- iris is similar to diaphragm
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Question 36
According to kinetic molecular model, in gases
Options
A) The particles are closely packed together, they occupy minimum space and are usually arranged in a regular pattern
B) The particles occur in clusters with molecules slightly farther apart
C) The molecule are very fast apart and occupy all the space made available
D) The particle vibrate about fixed positions and are held together by the strong intermolecular bonds between them
The correct answer is C.
Explanation:
In kinetic molecular model, gases are energized and thus moves freely, fast as they occupy specific space
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Question 37
The momentum of a car moving at a constant speed in a circular track
Options
A) can be both positive and negative
B) can be zero depending on its position in the track
C) can be zero depending on its position in the track
D) a centrifugal
The correct answer is C.
Explanation:
Movement of an object in a circle with an acceleration towards its center is provided by change in velocity and centripetal force a α V α Fc
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Question 38
The lead-acid accumulator consists of
Options
A) lead as the positive electrode
B) lead acid as the negative electrode
C) hydrochloric acid as the electrolyte
D) tetraoxosulphate (vi) acid as the electrolyte
The correct answer is D.
Explanation: - the positive pole is lead peroxide (PbO22)
- the negative pole is head
- the electrolyte is H22SO44
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Question 39
When water is boiling, it
Options
A) gets hotter
B) increase is mass
C) decreases in mass
D) changes to steam
The correct answer is D.
Explanation:
Boiling indicates changes from Liquid to gas.
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Question 40
A mixture of blue and red pigment when illuminated by white light will appear
Options
A) green
B) orange
C) purple
D) magenta
The correct answer is C.
Explanation:
A mixture of blue and red pigments i.e parts is purple or violet
Question 41
A siren having a ring of 200 hole makes 132 rev/min. A jet of air is directed on the set of holes. Calculate the frequency and wavelength in air of the note produced (take v = 350m/s)
Options
A) 0.875m
B) 0.625m
C) 0.335m
D) 0.125m
The correct answer is A.
Explanation:
n = 200, S = 132 rev/min, v = 350m/s22
f = ns = 200 × 132 rev
________________________________________min × 1min
________________________________________60s = 440Hz
λ = v
________________________________________f = 350
________________________________________440 = 0.875m
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Question 42
A man on a bench will exert the greatest pressure on the bench when he
Options
A) lies flat on his back
B) lies flat on his belly
C) stands on both feet
D) stands on the toes of one foot
The correct answer is D.
Explanation:
P = F
________________________________________A
hence, pressure increases when the areas decreases.
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Question 43
Gases conduct electricity under
Options
A) high pressure and high voltage
B) low pressure and low voltage
C) normal pressure and low voltage
D) low pressure and high voltage
The correct answer is D.
Explanation:
Gases conduct electricity under low pressure and high voltage
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Question 44
Neutrons were discovered by
Options
A) Faraday
B) Dalton
C) James Chadwick
D) Rutherford
The correct answer is C.
Explanation:
It was discovered by James Chadwick in 1932.
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Question 45
The mass of a nucleus is the
Options
A) total number of its proton and neutrons
B) number of its protons
C) mass of its electrons
D) total number of its protons and electrons
The correct answer is A.
Explanation:
Nucleus = mass of proton + mass of neutron
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Question 46
Three resistors with resistance 200Ω, 500Ω and 1kΩ are connected in series. A 6v battery is connected to either end of the combination. Calculate the potential difference between the ends of 200Ω resistance.
Options
A) 0.71V
B) 0.7V
C) 0.82V
D) 0.8V
The correct answer is A.
Explanation:
Req = 200 + 500 + 1000 = 1700Ω
P.d (across 200Ω) = 200
________________________________________1700 × 6 = 0.71V
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Question 47
An a.c of 1A at a frequency of 800 cycles per second flows through a coil, the inductance of which is 2.5mH and the resistance of which is 5Ω. What is the power absorbed in the Coil?
Options
A) 5W
B) 6W
C) 7W
D) 8W
The correct answer is A.
Explanation:
I = 1A, F = 800 cycles/s = 800Hz
R = 5Ω, L = 2.5mH
P = I22R = I22 × 5 = 5W
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Question 48
In semi-conductor, the carriers of current at room temperature are
Options
A) electrons only
B) electrons and holes
C) holes only
D) electron and ions
The correct answer is B.
Explanation:
Electron and holes represents the negative and positive charge respectively.
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Question 49
Water and Kerosine are drawn respectively into the two limbs of a Hare’s apparatus. The destiny of water is 1.0gcm−3−3 and the density of kerosine is 0.80gcm−3−3. If the height of the water column is 20.0cm, calculate the height of the kerosine column.
Options
A) 1.6cm
B) 16.0cm
C) 20.0cm
D) 25.0cm
The correct answer is D.
Explanation:
Devices with different liquids
d11h11 = d22h22
1 × 20 = 0.8 × h
h = 20
________________________________________0.8 = 25cm
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Question 50
When a girl moves towards a plane mirror at a speed of 4.0m/s, the distance between the girl and her image reduces a speed of
Options
A) 2 m/s
B) 4 m/s
C) 8 m/s
D) 12 m/s
The correct answer is C.
Explanation:
v = d
________________________________________t or v α d
d = x, v = 4m/s
d = 2x, v = ? (girl and image)
v = 2 × 4
________________________________________x = 8 m
________________________________________s