Myopic defects in the human eye can be corrected through the use of a
Trả lời
(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
Trả lời
(A)
Be a straight line
3
What happens to a water pool on a day when the humidity of the air is very low?
Trả lời
(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
Trả lời
(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?
Trả lời
(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
Trả lời
(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
Trả lời
(B)
40cm
8
Which of the following statements is correct about a machine?
Trả lời
(B)
Efficiency decreases with an increase in friction
9
The instrument used to view stars is the
Trả lời
(B)
Telescope
10
What is the angular magnification of a telescope having objective and eyepiece lenses of a focal lengths 30cm and 3cm respectively?
Trả lời
(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]
Trả lời
(C)
1.2 x 10-2m
12
When an athlete perspires after running, he loses heat through
Trả lời
(A)
Evaporation
13
The rate of cooling of a heated quantity of liquid in an enclosure depends on the
Trả lời
(B)
Temperature in the enclosure
14
The heat required to raise a mass of a substance through 1K is known as
Trả lời
(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
Trả lời
(A)
Infinite
16
Semiconductor is a class of solid whose conductivity increases with an increase in
Trả lời
(B)
Temperature
17
Which of the following statements is NOT correct?
Trả lời
(C)
The molecules of matter are not in constant motion
18
A dynamo primarily converts
Trả lời
(A)
Mechanical energy into electrical energy
19
A saturated vapour pressure of a liquid increases when the
Trả lời
(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
Trả lời
(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?
Trả lời
(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]
Trả lời
(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
Trả lời
(B)
10s
24
Which of the following electromagnetic waves has the shortest wavelength?
Trả lời
(D)
Gamma rays
25
A radioactive isotope has a decay constant of 10\(^{-6}\)s\(^{-1}\). Calculate its half-life.
Trả lời
(B)
6.93 x 105s
26
Which of the following waves is both transverse and mechanical?
Trả lời
(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]
Trả lời
(C)
153oC
28
The relative density of a liquid is the ratio of the
Trả lời
(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?
Trả lời
(B)
it will drop to zero
30
Which of the following does Not use magnetic effect of current to function?
Trả lời
(A)
Lead acid accumulator
31
Vapour is said to be saturated on top of an enclosed liquid if _________
Trả lời
(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]
Trả lời
(D)
1.330m
33
Shadows and eclipse result from the
Trả lời
(B)
Rectilinear propagation of light
34
Which of the following is obtained when a magenta is mixed with green colour?
Trả lời
(C)
White
35
Which of the following instruments can be used to measure current in an a.c circuit?
Trả lời
(D)
Moving coil galvanometer
36
Which of the following statements about wave motion is correct?
Trả lời
(A)
Electromagnetic waves are transverse
37
A satellite revolving around the earth is kept on its orbit by?
Trả lời
(A)
Centripetal forces only
38
A manometer is an instrument used for measuring
Trả lời
(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?
Trả lời
(B)
37.0N
40
The impulse of a force is deduced from Newton's second law as
Trả lời
(B)
F = m( \(\frac{v - u}{t}\)
41
Boiling occurs when the vapour pressure of a liquid is
Trả lời
(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
Trả lời
(D)
15cm
43
In the diagram above, which of the following velocity-time graphs shows uniform acceleration of a body from rest?
Trả lời
(C)
B
44
In the diagram above, the neutral point is at
Trả lời
(B)
X
45
From the diagram above, the measuring accuracy of the micrometer screw gauge is
