Q. The twinkling of a star is due to the atmospheric -
1) diffraction of starlight
2) reflection of starlight
3) refraction of starlight
4) dispersion of starlight
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. What is the dimension of the gravitational constant?
1) [ML3T-2]
2) [M-1L3T-2]
3) [M2L-2T-2]
4) [M2L-1T-2]
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 distances 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. Which one of the following correctly represents the SI unit of resistivity?
1) 8#8486;
2) 8#8486; /m
3) 8#8486; - cm
4) 8#8486; - m
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
Q. Which one of the following is a chemical change?
1) Dissolving sugar in water
2) Melting of ice
3) Crystallization
4) Milk turning sour
Q. Refining of petroleum is carried out using which one of the following techniques?
1) Evaporation
2) Fractional distillation
3) Separating funnel
4) Sublimation
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