Telescopes are placed in space to view distant galaxies primarily to

• get closer to the observed objects

• avoid the absorption of light or other radiations in the atmosphere of the earth

• avoid light pollution from the earth's populated areas

• avoid steering the telescope against the earth's motion

SONAR is mostly used by

• Doctors

• Engineers

• Astronauts

• Navigators

A bucket full of water is kept in a room and it cools from 75°C to 70°C in time T, minutes, from 70°C to 65°C in time T, minutes, and from 65°C to 60°C in time T, minutes, then

• T₁ = T₂ = T₃

• T₁ < T₂ < T₃

• T₁ > T₂ > T₃

• T₁ < T₃ < T₂

For a simple pendulum, the graph between T² and L (where T is the time period & L is the length) is

• straight line passing through origin

• parabolic

• Circle

• none of the above

Match List-I with List-II

List I (Magnet)

1. Artificial magnet
2. Permanent magnet
3. Temporary magnet
4. Earth as a magnet

List-II (Property)

1. Long-lived
2. Last for infinitely long period
3. Short-lived
4. Induced magne

• (a) - 3, (b) - 1, (c) - 4, (d) -2

• (a) - 3, (b) - 4, (c) - 1, (d) -2

• (a) - 2, (b) - 1, (c) - 4, (d) - 3

• (a) - 2, (b) - 4, (c) - 1, (d) - 3

A body weighs 5 kg on the equator. At the poles, it is likely to weigh

• 5 kg

• less than 5 kg but not zero

• 0 kg

• more than 5 kg

The polarity of an unmarked horseshoe magnet can be determined by using

• a charged glass rod

• a magnetic compass

• an electroscope

• another unmarked bar magnet

A glass of water does not turn into ice as it reaches 0°C. It is because

• water does not solidify at 0%C

• a certain amount of heat must be supplied to the glass of water so as to solidify

• a certain amount of heat must be taken out from the glass of water so as to solidify

• water solidifies at 0 K only

79.

For which among the following house appliances, magnet is an essential part?

• Calling bell

• Fan

• Washing machine

• All of the above

Consider the following statements

Hypermetropia is a defect of vision in which

1. a person cannot see the distant objects clearly
2. a person cannot see the near objects clearly
3. the near point of the eye gets shifted away from the normal position
4. the far point of the eye gets shifted towards the eye

Which of the statements given above are correct?

• 1 and 3

• 2 and 4

• 1 and 4

• 2 and 3