Which of the units of the following physical quantities are derived? I. Area II. Thrust III. Pressure IV. Mass
Answer
(B)
I, II, III only
2
The slope of a striaght line displacement time graph indicates the
Answer
(B)
Uniform velocity
3
A man will exact the greatest pressure on a bench when he
Answer
(E)
stand on toes of one foot
4
When three coplanar and non-parallel forces are in equilibrium,
I. they can be represented in magnitude and direction by the three sides of a triangle taken in order.
II. their lines of action meet at a point.
III. the magnitude of anyone equals the magnitude of the resultant of the other two.
IV. any one force is the equilibrant of the other two.
Which of the following statements above are correct?
Answer
(D)
I, II, III & IV
5
A ball of mass 0.5kg moving at 10ms-1 collides with another ball of equal mass at rest. If the two balls move off together after the impact, calculate their common velocity.
Answer
(C)
5.0ms-1
6
A body is projected into space with an initial velocity V0 at an angle, θ to the horizontal. Which of the following statements is/are correct about its motion?
I. The total time of flight is (V0 Cosθ)/g.
II. The maximum height is (V0 Sin 2θ)/2g.
III. The range is (V02 Cos2θ)/g.
Answer
(D)
II only
7
A catapult is used to project a stone. Which of the following energy conversions takes place as the stone is released?
Answer
(D)
The elastic potential energy of the catapult is converted into gravitational potential energy of the stone
8
A ball is thrown vertically upwards from the ground with an initial velocity of 50ms-1. What is the total time spent by the ball in the air? (g = 10ms-2)
Answer
(C)
10.0s
9
Which of the following correctly gives the relationship between linear speed V and angular speed ω of a body moving uniformly in a circle of radius r?
Answer
(A)
V = ωr
10
The motion of a body is simple harmonic if the
Answer
(C)
Acceleration is directed towards a fixed point and proportional to its distance from the point
11
Which of the following statements about the gaseous state of matter is not correct? The molecules of a substance is in gaseous state
Answer
(D)
have no intermolecular attractive force
12
Which of the following cannot be used to measure the temperature of a substance?
Answer
(E)
change in color with temperature
13
The clinical thermometer is characterized by having a
Answer
(D)
constriction
14
A given mass of gas has a pressure of 80Nm-2 at a temperature of 47oC. If the temperature is reduced to 27oC with the volume remaining constant, the new pressure is
Answer
(B)
75.0 Nm-2
15
Which of the following is a reason why a concrete floor feels colder to the bare feet than a mat on the same floor during the rainy season?
Answer
(D)
Concrete floor is a better conductor of heat than the mat
16
In which of the following is the expansion of solids a disadvantage?
Answer
(E)
the balance wheel of a watch
17
Which of the following best explains a person suffers more severe burns when his skin is exposed to steam than when boiling water is poured onto his skin?
Answer
(B)
steam posses greater heat energy per unit-mass than boiling water
18
Which of the following statements about radiant heat is/are not correct?
I. radiant heat cannot travel through a vacuum
II. rough surfaces emit radiant heat more than polished surfaces
III. Dark surfaces absorb radiant heat more than bright surfaces
Answer
(A)
I only
19
0.5kg of water at 10oC is completely converted to ice by extracting 188000J of heat from it. If the specific heat capacity of water is 4200J kg-1C-1, calculate the specific latent heat of fusion of ice.
Answer
(D)
334.0 KJ kg-1
20
The temperature at which the water vapour present in the air is just sufficient to saturate it is called the
Answer
(D)
dew point
21
Which of the following instrument may be used to measure the relative humidity?
Answer
(E)
Hygrometer
22
Which of the following will affect the saturation vapour pressure of a liquid?
Answer
(A)
Temperature of the liquid
23
Which of the following statements is/are not correct about image formed by a plane mirror?
I. The magnification produced is 1
II. The image distance is same as the object distance
III. The image is real
IV. The image is laterally inverted
Answer
(C)
III only
24
A transparent rectangular block 5.0cm thick is placed on a black dot. The dot when viewed from above is seem 3.0cm from the top of the block calculate the refractive index of the material of the block.
Answer
(D)
5/3
25
The velocities of light in air and glass are 3.0 x10\(^8\)ms\(^{-1}\) and 1.8 \(\times \)10\(^8\) ms\(^{-1}\) respectively. Calculate the sine of the angle of incidence that will produce an angle of refraction of 30° for a ray of light incident on glass.
Answer
(C)
0.8
26
An object is placed 36cm from a converging lens of focal length 24cm.If a real image which is 4cm high is formed, Calculate the height of the object.
Answer
(A)
2.0cm
27
The ability of the eye to focus objects at different distances is called
Answer
(B)
accommodation
28
The change of the direction of a wave-front because of a change in the velocity of the wave in another medium is called?
Answer
(A)
refraction
29
A source of sounds produces waves in air of wavelength1.65m. If the speed of sound in air is 330ms-1 the period of vibration in seconds is
Answer
(E)
0.005
30
Which of the following statement s is/are not correct about a standing wave? I. It is formed by the superimposition of two progressive waves traveling in the same direction II. All points on the wave are vibrating with maximum displacement III. It is formed by the superimposition of two progressive waves of different amplitudes traveling in opposite directions
Answer
(E)
I,II and III
31
A boy standing a distance from the foot of a tall cliff claps his hands and hears an echo 0.5s later. If the speed of sound is 340ms1, how far is he from the cliff?
Answer
(C)
85m
32
A sounding tuning fork is brought near the end of a pipe containing an air column and the loudness of the sound increases. This effect is due to
Answer
(C)
resonance
33
If the leaves a positively charged electroscope collapse completely as an object is brought near the cap of the electroscope, the objects possesses
Answer
(E)
an equal amount of negative charge
34
A transformer with 5500 turns in its primary is used between a 240V a. c supply and a 120V kettle. Calculate the number of turns in the secondary
Answer
(B)
2750
35
Local action is normally prevented from taking place in a simple electric cell by
Answer
(C)
amalgamating the surface of the zinc plate
36
A cell can supply current of 0.8A and 0.4A through a 2Ω and a 3Ω resistors respectively. Calculate the internal resistance of the cell.
Answer
(C)
1.0Ω
37
A battery of emf 24V and internal resistance 4Ω is connected to a resistor of 32Ω. What is the terminal p.d of the battery?
Answer
(B)
21.3V
38
Two parallel conductors carry equal currents in the same direction. Which of the following statement is not a correct observation?
Answer
(E)
The two conductors will repel each other
39
It takes 4 minutes to boil a quantity of water electrically. How long will it take to boil same quantity of water using the same heating coil but with the current doubled? (neglecting any external heat loss).
Answer
(E)
1 minute
40
A lamp is marked 220V 60 W. Calculate the energy it would consume when connected to a 220V source for 1 hour.
Answer
(A)
216000J
41
What is the effect of using split-rings in a simple d.c motor?
Answer
(C)
The current in the coil becomes alternating
42
Which of the following statement is not correct about loaded spiral spring?
Answer
(C)
Up to the yield limit, extension is no longer proportional to the applied load.
43
Calculate the resistivity of a wire of length 2m and cross-sectional area 0.004cm2 if the resistance is 3.0 Ω.
Answer
(B)
0.006Ωcm
44
Which of the following particles of ray has the highest penetrating power?
Answer
(C)
Gamma particles
45
When sugar at the bottom of a glass of water gradually dissolves, the water level does not change applicably. Which of the following statements best describe this?
Answer
(E)
Water molecules are separated by large spaces between them
46
Which of the following explains the concave meniscus of water in a glass tube?
Answer
(A)
The adhesion between water and glas is greater than the cohesion between water molecules
47
The unit of inductance is the
Answer
(B)
henry
48
Which of the following is/are not correct about isotopes of an element? The have
Answer
(A)
the same neutron number
49
Which of the following is/are not affected by a magnetic field?
I. Neutrons
II. Cathode rays
III. Alpha particles
Answer
(A)
I only
50
An electron of charge 1.6 x 1019C is accelerated in vacuum from rest at zero volt towards a plate of 40KV. Calculate the kinetic energy of the electron.
