Home
Current Affairs January 2024

What is the correct answer?

4

We see the flash of lightning before hearing the thunder because

A. light travels very much faster than sound

B. sound travels faster than light

C. lightning occurs nearer than thunder

D. both travel at the same speed

Correct Answer :

A. light travels very much faster than sound


Related Questions

What is the correct answer?

4

An electric fan converts

A. electrical energy into heat energy

B. electrical energy into mechanical energy

C. mechanical energy into electrical energy

D. mechanical energy into heat energy

What is the correct answer?

4

Dioptre is the unit of power of

A. convex mirrors

B. concave mirrors

C. concave lenses

D. lenses irrespective of types

What is the correct answer?

4

Acoustics is a property or

A. Physics

B. Chemistry

C. Biology

D. Economic

What is the correct answer?

4

If a band is played on the moon the sound will

A. reverberate

B. be heard by us faintly

C. be heard upto 10 km from it

D. not be heard at any distance at all from it

What is the correct answer?

4

The aneroid barometer uses

A. mercury

B. distilled water

C. alcohol

D. does not use any liquid

What is the correct answer?

4

The atmosphere gets heated up mainly by

A. direct sun's rays

B. radiation from earth's surface

C. radiogenic heat (resulting from radioactive decay)

D. cosmic rays coming from space

What is the correct answer?

4

Skating on ice is possible because

A. the surface of ice is smooth

B. ice is cold

C. the pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water

D. the pressure on the ice due to skate raises its melting point

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

Electromagnets are used in

A. the telephone ear piece

B. the telegraph

C. the electric bell

D. All the above

What is the correct answer?

4

A lactometer la used to

A. find out the specific gravity of liquids

B. measure the volumes of liquids

C. test the purity of milk

D. determine the strength of acid in car batteries

What is the correct answer?

4

The earth satellite Aryabhatta was put in orbit by India on

A. October 20, 1978

B. November 14, 1978

C. January 26, 1979

D. April 19, 1975

What is the correct answer?

4

The function of a moderator in a nuclear reactor is

A. to absorb unwanted neutrons

B. to slow down the fast neutrons to secure more effective hits on other nuclei

C. to decrease the number of fissile nuclei

D. to increase the number of fissile nuclei

What is the correct answer?

4

Which force is used when milk is churned to separate cream?

A. cohesive

B. centrifugal

C. frictional

D. gravitational

What is the correct answer?

4

X-rays were discovered by

A. Wilhelm Roentgen

B. WO Coolidge

C. Henry Cavendish

D. William Watson

What is the correct answer?

4

For viewing objects placed at a higher level from a position at a lower level, the instrument used' Is known aa

A. telescope

B. spectrometer

C. microscope

D. periscope

What is the correct answer?

4

X-rays are

A. deflected by electric field

B. deflected by magnetic field

C. slightly deflected by electric field and magnetic field

D. not deflected by electric and magnetic fields

What is the correct answer?

4

The light from the star nearest to the sun reaches the earth in

A. 8 minutes

B. 4.3 years

C. 12 seconds

D. 24 hours

What is the correct answer?

4

Where does the centre of gravity of a rubber ring lie?

A. on the outer surface

B. in the inner surface

C. at the centre of the ring

D. None of the above

What is the correct answer?

4

When white light passes through a glass prism we get a spectrum on the other side of the prism. In the emergent beam the ray which is deviated least is

A. the violet ray

B. the red ray

C. the green ray

D. the blue ray

What is the correct answer?

4

A temperature below absolute zero for an ideal gas

A. cannot be attained experimentally

B. can be attained

C. is impossible

D. Does not exist at all

What is the correct answer?

4

The number of galaxies that are visible without telescope on clear dark nights and away from bright lights is

A. one

B. two

C. three

D. infinite

What is the correct answer?

4

Body A is kept in contact with body B. Heat will flow from A to B if

A. the heat content of A is greater than that of B

B. the temperature of A is greater than that of B

C. the specific heat of A is greater than that of B

D. the specific heat of B is greater than that of A

What is the correct answer?

4

In a vacuum the following three articles are dropped at the same time and from the lame height. Which will reach the ground quicker?

A. a stone

B. a piece of wood

C. a feather

D. all will reach the ground at the same time

What is the correct answer?

4

Tap water is placed in an open pad and allowed to evaporate. After some time the temperature of water

A. increases to a great extent

B. increases slightly

C. decreases slightly

D. decreases rapidly

What is the correct answer?

4

The inside of both the walls of a thermos flask is silvered i.e., on the vacuum side in order to reduce heat loss by

A. convection

B. radiation

C. conduction

D. All the three

What is the correct answer?

4

Which of the following pairs is not correct?

A. Television - Baird

B. Transistor ~ Shockley

C. Thermometer - Celsius

D. Barometer Torricelli

What is the correct answer?

4

Which of the following rays has the highest penetrative power?

A. �± -rays

B. �² -rays

C. �³ -rays

D. X-rays

What is the correct answer?

4

In experiments on static electricity the standard method for obtaining small amounts of positive electricity is to rub

A. a glass rod with flannel

B. an abonite rod with flannel

C. a glass rod with silk

D. Any of the above

What is the correct answer?

4

A hunter on the ground wishes to shoot a bird on a tree at a distance with his rifle. He has to point the rifle

A. at the lower elevation than the bird

B. at a higher elevation than the bird

C. in the same direction as the bird

D. vertically upwards

What is the correct answer?

4

The direction of heat flow between two objects depends on

A. their heat contents

B. their masses

C. their temperatures

D. whether they are in solid, liquid or gaseous state