Q. A sound wave has a frequency of 1 kHz and a wavelength of 50 cm. How long will it take to travel 1 km?
1) 5 s
2) 4 s
3) 3 s
4) 2 s
Q. The energy possessed by a body due to its change in position or shape is called -
1) thermal energy
2) potential energy
3) kinetic energy
4) electric energy
Q. A boy of mass 52 kg jumps with a horizontal velocity of 2 m/s onto a stationary cart of mass 3 kg. The cart is fixed with frictionless wheels. Which one of the following would be the speed of the cart?
1) 2.15 m/s
2) 1.89 m/s
3) 1.51 m/s
4) 2.51 m/s
Q. A 5N force is defined when a mass of 10 kg is accelerated with -
1) 5.0cm/s2
2) 0.5 m/s2
3) 0.5 cm/s2
4) 5.0 m/s2
Q. A mass M is dragged by a pulley on a horizontal plane by a force anti-parallel to its displacement. The work done in pulling the mass M is -
1) zero
2) positive
3) infinite
4) negative
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
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