Science Physics questions from IAS 2001.
When water is heated from 0ºC to 10ºC, its volume:
When a CD (compact disc used in audio and video systems) is seen in sunlight, rainbow like colours are seen. This can be explained on the basis of the phenomenon of:
Consider the following statements: A simple pendulum is set into oscillation. Then: 1. The acceleration is zero when the bob passes through the mean position. 2. In each cycle the bob attains a given velocity twice. 3. Both acceleration and velocity of the bob are zero when it reaches its extreme position during the oscillation. 4. The amplitude of oscillation of the simple pendulum decreases with time. Which of these statements are correct?
A hollow sphere of radius R, a hollow cube of side R and a thin circular plate of radius R, made up of the same material, are all heated to 20°C above room temperature. When left to cool in the room, which of them will reach the room temperature first?
Consider the following statements: In a nuclear reactor, self-sustained chain reaction is possible, because: 1. More neutrons are released in each of the fission reactions. 2. The neutrons immediately take part in the fission process. 3. The fast neutrons are slowed down by graphite. 4. Every neutron released in the fission reaction initiates further fission. Which of these statements are correct?
When light waves pass from air to glass, the variables affected are:
Assertion (A): A piece of copper and a piece of glass are heated to the same temperature. When touched, thereafter, the copper piece appears hotter than the glass piece. Reason (R): The density of copper is more than that of glass. Codes:
Assertion (A): A stick is dipped in water in a slanting position. If observed sideways, the stick appears short and bent at the surface of water. Reason (R): A light coming from the stick undergoes scattering from water molecules giving the stick a short and bent appearance.
Which one of the following is NOT radioactive?
Assertion (A): The boiling point of water decreases as the altitude increases. Reason (R): The atmospheric pressure increases with altitude. Codes:
Which of the following distance-time graph (x-t) represents one-dimensional uniform motion?