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1.
Suppose a tunnel is dug along a diameter of the earth. A particle is dropped from a point, a distance h directly above the tunnel, the motion of the particle is
2.
Which one of the following types of waves are used in a night vision apparatus?
3.
4.
Consider the following statements with reference to observations made by an astronaut on the surface of moon:
1. The astronaut finds that a simple pendulum continues to oscillate for a much longer time, than that on the earth.
2. No atmosphere exists there.
Which of the statements given above is/are correct?
1. The astronaut finds that a simple pendulum continues to oscillate for a much longer time, than that on the earth.
2. No atmosphere exists there.
Which of the statements given above is/are correct?
5.
If the length of second's pendulum is increased by 2%, how many seconds will it lose per day?
6.
7.
A sonometer wire having a length of 50 cm is vibrating in the fundamental mode with a frequency of 100 Hz. Which of the following is the type of propagating wave and its speed?
8.
The Visible light has a wavelength range from about 380 nm (violet) to 780 nm (red). If an excited object emits light with wavelength of 15 nm, to which one of the following ranges does it belongs?
9.
Which one among the following statements is not correct?
10.
Sound moves with higher velocity if