Physics PYQ — Page 3

Assertion (A): An iron ball floats on mercy but gets immersed in water. Reason (R): The specific gravity of iron is more than that of mercury. Codes:

Consider the following natural phenomena: 1. Terrestrial heating 2. Reflection of light 3. Refraction of light 4. Diffraction of light Due to which of these phenomena is a mirage formed?

Assertion (a): Artificial satellites are always launched from the earth in the eastward direction. Reason (R): The earth rotates from west to east and so the satellite attains the escape velocity.

Which one of the following is NOT radioactive?

Which of the following distance-time graph (x-t) represents one-dimensional uniform motion?

Assertion (A): The boiling point of water decreases as the altitude increases. Reason (R): The atmospheric pressure increases with altitude. 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.

When light waves pass from air to glass, the variables affected are:

When water is heated from 0ºC to 10ºC, its volume:

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 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?

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:

A noise level of 100 decibels would correspond to

Fluorescent tubes are fitted with a choke. The choke coils

Match List I with List II and select the correct answer using the codes given below the Lists: List I (Institute) | List II (Location) I. Central Institute of Higher Tibetan Studies | A) Hyderabad II. Indira Gandhi Institute of Development Research | B) Mumbai III. National Institute of Mental Health and Neurosciences | C) Bangalore IV. Central Institute of English and Foreign Languages | D) Dharamshala | E) Varanasi

Which one of the following does a TV remote control unit use to operate a TV set?

When a CD (Compact Disc used in audio and video systems) is seen in sunlight, rainbow like colours is seen. This can be explained on the basis of the phenomenon of

For reproducing sound, a CD (Compact Disc) audio player uses a

A ‘black hole’ is a body in space which does not allow any radiation to come out. This property is due to its

Consider the following features of newer models of motor cars: 1. Radial tyres 2. Streamlined body 3. Multipoint fuel injection 4. Catalytic converter with exhaust Which of these features make the newer models of motor cars more fuel efficient?

Assertion (A): Small glass beads fixed on traffic signals glow brightly when light falls upon them. Reason (R): Light is totally reflected when the angle of incidence exceeds a certain critical value and light travelling in a denser medium is reflected from a rarer medium.

Assertion (A): In a motion picture, usually 24 frames are projected every second over the whole length of the film. Reason (R): An image formed on the retina of eye persists for about 0.1 s after the removal of stimulus.