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
Q. Consider the following statements about the microphone and the speaker of a mobile phone -
1. The microphone converts sound to a mechanical signal.
2. The microphone converts sound to an electrical signal.
3. The speaker converts a mechanical signal to sound.
4. The speaker converts an electrical signal to sound.
Which of the statements given above are correct?
1) 1 and 3
2) 1 and 4
3) 2 and 3
4) 2 and 4
Q. A 100 W electric bulb is used for 10 hours a day. How many units of electrical energy are consumed by the bulb in 3 days (1 unit = 1 kWh)?
1) 3.00
2) 1.08
3) 2.16
4) 0.33
Q. The area under the velocity-time graph for a particle moving in a straight line with uniform acceleration gives -
1) its average velocity
2) its net displacement
3) the distance travelled by it
4) its average speed
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