Model Practice Test- 3 - UPSC MCQ

Bell- metal is t he metal u sed for m aking bell s for churches. This metal gives the bell its special, ringing sound. It contains:

Ice floats on water because it has an open structure compared to water and therefore occupies a greater volume of space for the same weight. This open structure of ice is due to:

Very fast conduction of electricity by matter is called supercon-ductivity. This happens when matter is:

Many fruits have pleasant odour. Some of the pleasant odour of common fruits are due to:

Glycol is used in car radiators as

What are asteroids?

Which of the following statements in correct?

1. The earth spins at the rate of 1500 km per hour.
2. The earth spins faster during September than during March in any year.
3. The latitude 23.5° north of the earth’s equator is called the Tropic of Cancer.
4. The Tropic of Capricon is the latitude 23.5°south of the earth’s equator.

How many meteors fall through the earth’s atmosphere every day?

Which of the following statements is correct?

1. The Earth has 81 times the mass of the Moon.
2. Moon and the Earth are of the same age.
3. Mercury and Pluto have no atmosphere
4. Sun rotates faster in its equatorial region (once in 27 days) than in its polar region (once in 32 days).

The largest organ of the human body is

 The wavelength of gamma rays is

Under sui table c onditi on s, four hydrogen nuc lei combine to form the nucleus of helium atom. This phenomenon is known as

Which of the following statements is correct?

1. X-ray is produced w hen cathode rays strike metals of high atomic weight.
2. The velocity of light in empty space will change if the source of light is set into motion.
3. Choke coil is used as a resistance in A.C. circuits.
4. Gamma rays can not be deflected by a magnetic field.

If the direction of current through a resistance i s reversed, then the heating effect will

Which of the following statements is true?

1. In order to convert a galvanometer in to an ammeter, a small resistance must be connected in parallel with the galvanometer's coil.
2. If the diameter of a w ire is reduced to half its previous value, then its resistance will increase four times.
3. During charging of a lead accumulator, the density of sulphuric acid in the accumulator increases.
4. In the electrolysis of water oxygen is given off at the cathode.

In electrolysis of water, if 1 gm of hydrogen is liberated during a given time, then the amount of oxygen liberated during the same will be:

Which of the following statements is true?

1. Velocity of sound in air is proportional to the squareroot of its absolute temperature.
2. Under similar conditions the speed of sound in hydrogen is four times the speed in oxygen.
3. Only odd harmonics are present in the longitudinal vibrations in the air in a closed pipe.
4. Two identical waves are said to be coherent if their phases are equal.

If we look at a red flower through a green glass during the day, the flower will look

Which of the following statements is true?

1. Images formed by a concave lens are always smaller than the object.
2. The least distance of distinct vision for a normal eye is 25 cm.
3. A convex lens when immersed in water will have its focal length increased four times approximately.

23. At the temperature of boiling point of a liquid, its vapour pressure is

The density of mercury is

Which of the following contains photosynthetic pigment?