Q. A lemon kept in water in a glass tumbler appears to be larger than its actual size. It is because of -
1) Reflection of light
2) Scattering of light
3) Refraction of light
4) Polarisation of light
Q. The correct relation between the radius of curvature R and focal length f of a spherical mirror is -
1) R = f
2) R = 2f
3) R = 3f
4) R = 4f
Q. Which of the following statements is NOT correct regarding the travel of sound waves?
1) Sound waves can travel through water
2) Sound waves can travel through the air
3) Sound waves can travel through steel
4) Sound waves can travel through the vacuum
Q. A liquid is kept in a glass beaker. Which of the following statements is correct regarding the pressure exerted by the liquid column at the base of the beaker?
1) The pressure depends on the area of the base of the beaker
2) The pressure depends on the height of liquid column
3) The pressure does not depend on the density of the liquid
4) The pressure neither depends on the area of the base of the beaker nor on the height of the liquid column
Q. When a body moves uniformly along a circular path, its velocity -
1) changes
2) is perpendicular
3) remains unaltered
4) None of these
Q. The gravitational force with which the Earth attracts the Moon -
1) is greater ten the force with which the Moon attracts the Earth
2) is equal to the force with which the Moon attracts the Earth
3) Is less then the force with which the Moon attracts the Earth
4) None of the these
Q. In S.I. system , the unit of energy is
1) Joule
2) Volt
3) Calorie
4) Erg
Q. How many maximum electrons can M shell have?
1) 18
2) 8
3) 1
4) 2
Q. What do you call a component of identical size that offers a higher resistance to electricity?
1) Poor conductor
2) Semi-conductor
3) Good conductor
4) Very Good conductor
Q. A person burned a firecracker in front of a cliff and heard its echo 5 seconds after it burst. The distance of the cliff from the person, if the speed of the sound is 340 m/s, is close to -
1) 1700 m
2) 170 m
3) 85 m
4) 850 m
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