Myopic defects in the human eye can be corrected through the use of a
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(B)
Concave lens
2
A charged particle is moving in a uniform magnetic field. if the direction of motion of the charged particle is parallel to the magnetic field, the path of the charge will
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(A)
Be a straight line
3
What happens to a water pool on a day when the humidity of the air is very low?
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(D)
Rapid evaporation
4
A satellite moves in a circular orbit of radius 4R round the earth. The acceleration of the satellite in terms of g is
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(A)
\(\frac{g}{16}\)
5
I.Chemical II.Sound III.Electricity
Which of the above forms of energy can directly be converted to light energy?
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(D)
I and III only
6
If the distance between the object and the pinhole of a pinhole camera is reduced by half the size of the image of the object
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(D)
Is double
7
An object is placed 15cm in front of a plane mirror. If the mirror is moved further 5cm away from the object and the image is
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(B)
40cm
8
Which of the following statements is correct about a machine?
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(B)
Efficiency decreases with an increase in friction
9
The instrument used to view stars is the
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(B)
Telescope
10
What is the angular magnification of a telescope having objective and eyepiece lenses of a focal lengths 30cm and 3cm respectively?
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(B)
10
11
A wire of length 10m is cooled from 50oC to 10oC. Calculate the decrease in the length of the wire. [c = 3 x 10-5K-1]
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(C)
1.2 x 10-2m
12
When an athlete perspires after running, he loses heat through
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(A)
Evaporation
13
The rate of cooling of a heated quantity of liquid in an enclosure depends on the
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(B)
Temperature in the enclosure
14
The heat required to raise a mass of a substance through 1K is known as
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(D)
Heat capacity
15
A boy in a barber's shop sits between two parallel mirrors. The number of images observed by him will be
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(A)
Infinite
16
Semiconductor is a class of solid whose conductivity increases with an increase in
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(B)
Temperature
17
Which of the following statements is NOT correct?
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(C)
The molecules of matter are not in constant motion
18
A dynamo primarily converts
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(A)
Mechanical energy into electrical energy
19
A saturated vapour pressure of a liquid increases when the
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(A)
Temperature of a liquid increases
20
What force has to be exerted on a mass 60kg to give it an acceleration of 10ms-2 vertically upwards?
[g = 10ms-2
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(C)
1200N
21
A metre rule is pivoted at its mid-point with a vertical force of 10N hanging from the distance 30cm from the mid-point. At what distance must a 15N force hang to balance the ruler horizontally?
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(C)
20cm
22
A projectile is fired from the ground level with a velocity of 300ms-1 at an angle of a 30o to the horizontal.
Calculate the time taken to reach the maximum height?
[g = 10ms-2]
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(D)
15s
23
A train with an initial velocity of 20ms-1 is subjected to a uniform deceleration of 2ms-2. The time required to bring the train to a complete halt is
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(B)
10s
24
Which of the following electromagnetic waves has the shortest wavelength?
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(D)
Gamma rays
25
A radioactive isotope has a decay constant of 10\(^{-6}\)s\(^{-1}\). Calculate its half-life.
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(B)
6.93 x 105s
26
Which of the following waves is both transverse and mechanical?
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(A)
Water waves
27
Calculate the temperature of 6 moles of an ideal gas at a pressure of 7.6 x 106Nm-2 with a volume of 10-3m3.
[R = 8.3jmol-1K-1]
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(C)
153oC
28
The relative density of a liquid is the ratio of the
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(B)
Upthrust in the liquid to the upthrust in water
29
What will happen to the pressure of a gas if its temperature is reduced to -273oC?
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(B)
it will drop to zero
30
Which of the following does Not use magnetic effect of current to function?
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(A)
Lead acid accumulator
31
Vapour is said to be saturated on top of an enclosed liquid if _________
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(B)
The rate of condensation is equal to that of vapourization
32
A pool of water appears to be 1.00m deep when viewed vertically from above. What is the actual depth of the pool?
[Refractive index of water = 1.33]
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(D)
1.330m
33
Shadows and eclipse result from the
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(B)
Rectilinear propagation of light
34
Which of the following is obtained when a magenta is mixed with green colour?
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(C)
White
35
Which of the following instruments can be used to measure current in an a.c circuit?
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(D)
Moving coil galvanometer
36
Which of the following statements about wave motion is correct?
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(A)
Electromagnetic waves are transverse
37
A satellite revolving around the earth is kept on its orbit by?
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(A)
Centripetal forces only
38
A manometer is an instrument used for measuring
отговор
(B)
Pressure in liquids and gases
39
A body which weighs 50N in air displaces 3.7kg of water when partially immersed in water. Calculate the upthrust on the body?
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(B)
37.0N
40
The impulse of a force is deduced from Newton's second law as
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(B)
F = m( \(\frac{v - u}{t}\)
41
Boiling occurs when the vapour pressure of a liquid is
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(D)
Equal to the atmospheric pressure
42
If the magnification of a virtual image formed by an object 10cm from a convex less is 3, then the focal length of the lens is
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(D)
15cm
43
In the diagram above, which of the following velocity-time graphs shows uniform acceleration of a body from rest?
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(C)
B
44
In the diagram above, the neutral point is at
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(B)
X
45
From the diagram above, the measuring accuracy of the micrometer screw gauge is
