Home
Current Affairs January 2024

What is the correct answer?

4

A thermostat is a device used

A. for automatically maintaining a steady temperature

B. for measuring electricity

C. to reduce the voltage of electricity

D. for producing heat

Correct Answer :

A. for automatically maintaining a steady temperature


Related Questions

What is the correct answer?

4

You want a supply of a small but constant current. Which of the following cells will you prefer?

A. Daniell cell

B. Leclanche cell

C. Dry cell

D. All the above

What is the correct answer?

4

Before the invention of geostationary satellites, television stations could not transmit their programmes to far off places because

A. these signals are electromagnetic in nature

B. these are not electromagnetic in nature

C. their wavelength is very large

D. they are not reflected by the ionosphere but pass through it

What is the correct answer?

4

The motion .of the pendulum of a wall clock is an example of

A. linear motion

B. vibratory motion

C. rotational motion

D. None of the above

What is the correct answer?

4

Thick brick walls are used in the construction or a cold storage because bricks

A. are good conductors of heat

B. are cheaper

C. are easily obtained

D. are bad conductors of heat

What is the correct answer?

4

The orbit of Venus lies between those of

A. Mercury and Earth

B. Earth and Mars

C. Mars and Saturn

D. Mars and Jupiter

What is the correct answer?

4

Air escaping rapidly from a narrow orifice in an inflated tyre feels cool because

A. the speed with which it escapes cools it down

B. of the higher temperature of the surroundings

C. of sudden expansion causing loss of internal energy

D. there is no real fall in temperature

What is the correct answer?

4

The heat generated in a conductor carrying current is proportional to

A. the resistance

B. the square of the current flowing through it

C. the time the current flows

D. All the above

What is the correct answer?

4

A thermostat is a device used

A. for automatically maintaining a steady temperature

B. for measuring electricity

C. to reduce the voltage of electricity

D. for producing heat

What is the correct answer?

4

The device used to record the sound is

A. a microphone

B. a headphone

C. a phonograph

D. an amplifier

What is the correct answer?

4

The Cact that the compass needle does not point true north was observed first by

A. Sir Isaac Newton

B. Columbus

C. Archimedes

D. Thomas Alva Edison

What is the correct answer?

4

The velocity required to place a vehicle in orbit round the moon is _________ that required to place it in orbit round the earth.

A. less than

B. greater than

C. equal to

D. greater than or equal to

What is the correct answer?

4

When a bowler spins a ball, it changes its direction in the air. This is due to

A. turbulence caused by the wind

B. buoyancy of air

C. unequal pressures acting on it

D. sudden change in the direction of the wind

What is the correct answer?

4

Which of the following has the highest refractive index?

A. Crown glass

B. Water

C. Flint glass

D. Diamond

What is the correct answer?

4

The study of astronomy include a

A. astrology

B. astrophysics

C. astrometry

D. Both (b) and (c) above

What is the correct answer?

4

An ammeter has

A. a high resistance

B. a very low resistance

C. no resistance at all

D. resistance of 400 ? w

What is the correct answer?

4

In very cold countries alcohol is used as a thermometric liquid because

A. alcohol is a poor conductor of heat

B. alcohol can be coloured for its level to be seen easily

C. its freezing point is very low

D. it will not stick to the glass tube

What is the correct answer?

4

Sound travels fastest in

A. air

B. water

C. iron

D. vacuum

What is the correct answer?

4

The largest reserve of radioactive element which can be used in a nuclear reactor has been found in India, The name of the element is

A. Thorium

B. Uranium

C. Plutonium

D. Radium

What is the correct answer?

4

When a swing la drawn to a side Its potential energy In relation to the earth

A. increases

B. decreases

C. remains the same

D. is constant

What is the correct answer?

4

It is easier to climb down a staircase than climb up because in climbing down

A. work is done against gravity

B. the steepness of the staircase isn't felt

C. gravity assists

D. there is no friction between the legs and steps

What is the correct answer?

4

Electron-volt is a unit of

A. power

B. velocity

C. energy widely used in nuclear physics

D. number of electrons

What is the correct answer?

4

Hydrophone is an instrument used

A. for measuring relative density of liquids

B. by ships to pass on messages

C. for determining the depth of ocean bottoms etc.

D. by deaf people to aid hearing

What is the correct answer?

4

A man stands on the pan of a balance holding a fish in his right hand and bucket of water in his left hand. If he transfers the fish into the bucket, the total weight on the pan

A. increases

B. decreases

C. remains the same

D. first increases and then decreases

What is the correct answer?

4

When a body Is taken to the poles from the equator, Its weight becomes

A. greater

B. less

C. the same

D. None of these

What is the correct answer?

4

The freezer in a refrigerator is placed near the top

A. to keep it away from the hot compressor which is near the bottom

B. because of convenience

C. so that it can cool the whole interior by setting up convection currents

D. to prevent too much cooling

What is the correct answer?

4

When a bullet is fired from a gun

A. the gun moves forward

B. the gun jumps up

C. the gun does not move

D. the gun recoils with the same momentum as the bullet

What is the correct answer?

4

The brightest star visible to the naked eye is

A. Sirius

B. Vega

C. Rigel

D. Proxima Centauri

What is the correct answer?

4

A boy sitting in a train moving with a uniform velocity drops a coin outside. A man standing outside the train will find the trajectory of the coin to be

A. a parabola

B. a horizontal straight line

C. a vertical straight line

D. a circle

What is the correct answer?

4

The phenomenon of radioactivity was discovered by

A. Rutherford

B. Bohr

C. Henri Bacquerel

D. Marie Curie

What is the correct answer?

4

Thick brick walls are used in the construction or a cold storage because bricks

A. are good conductors of heat

B. are cheaper

C. are easily obtained

D. are bad conductors of heat