Q. The time period of a 1 m long pendulum approximates to -
1) 6 s
2) 4 s
3) 2 s
4) 1 s
Q. A ball is thrown vertically upward with a speed of 40 m/s. The time taken by the ball to reach the maximum height would be approximately -
1) 2 s
2) 3 s
3) 4 s
4) 5 s
Q. The magnetic field produced by a current-carrying straight wire at a point outside the wire depends -
1) inversely on the distance from it
2) directly on the distance from it
3) inversely at short distances and directly at large distance from it
4) directly on the distance (at short distances) and inversely on the distance (at long distances) from it
Q. What is the current required to light a 60 W incandescent bulb in a domestic supply of 240 V?
1) 0.5 A
2) 0.25 A
3) 1.0 A
4) 5.0 A
Q. The frequency of an alternating current is 3 Hz. It implies that -
1) there are 6 cycles/s
2) there are 3 cycles/s
3) there are 2 cycles/s
4) there is only 1 cycle/s
Q. The Freezer in a refrigerator is located at the top section because -
1) The entire chamber of the refrigerator is cooled quickly due to convection
2) The motor is protected from heating
3) The heat gained from the environment is high
4) The heat gained from the environment is low
Q. If the potential difference between the ends of a fixed resistor is halved, the electric power will become -
1) double
2) half
3) four time
4) one by four times
Q. If a current is passed through a spring, then the spring will -
1) expand
2) compress
3) remain same
4) first expand then compress
Q. The twinkling of stars is due to -
1) Atmospheric refraction of star light
2) Scattering of light by dust particles
3) Dispersion of light by water drops
4) Reflection of light by clouds
Q. Which one of the following is an Acoustic unit?
1) Calorie
2) Decibel
3) Ampere
4) Volt
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