Home
Current Affairs January 2024

What is the correct answer?

4

Mercury does not stick to glass because

A. cohesive forces between the mercury molecules are greater than adhesive forces between mercury and glass molecules

B. the adhesive forces between mercury and glass molecules are greater than the cohesive forces

C. both the cohesive and adhesive forces are equal

D. None of the above

Correct Answer :

A. cohesive forces between the mercury molecules are greater than adhesive forces between mercury and glass molecules


Related Questions

What is the correct answer?

4

When a steel ball is placed on the surface of mercury, it does not sink because

A. of the surface tension of mercury

B. mercury is a semi-solid

C. of the high viscosity of mercury

D. the density of mercury is greater than that of steel

What is the correct answer?

4

A bar magnet tied in the middle with a thread is suspended at the South Pole of the earth. The magnet will be in

A. a horizontal position

B. a nearly vertical position with its South Pole downwards

C. a nearly vertical position with its North Pole downwards

D. a slanting position

What is the correct answer?

4

The hygrometer is an apparatus used for finding the

A. temperature of air

B. intensity of light

C. density of a liquid

D. relative humidity of the atmosphere

What is the correct answer?

4

A photon is

A. a quantum of electromagnetic radiation

B. light source used in photography

C. a photo film

D. sun-light

What is the correct answer?

4

In an electrical circuit, a fuse is connected

A. in the live wire

B. in the neutral wire

C. in the earth wire

D. anywhere

What is the correct answer?

4

The evaporation rate depends on

A. the nature of the liquid

B. area of the exposed surface of the liquid

C. temperature of air and of the liquid

D. All the above

What is the correct answer?

4

The numerical reading of the Fahrenheit thermometer of a given temperature

A. is proportional to that of the Celsius thermometer

B. is always greater than that of the Celsius thermometer

C. is always less than that of the Celsius thermometer

D. may be greater than or less than or equal to that of the Celsius thermometer

What is the correct answer?

4

Holography is the technique of

A. taking photos of various objects

B. recording and reproducing three dimensional images

C. tracing out planets and stars in the sky

D. transmitting light waves

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

In a microphone

A. sound energy is converted into electrical energy

B. electrical energy is converted into sound energy

C. sound energy is converted into mechanical energy

D. mechanical energy is converted into sound energy

What is the correct answer?

4

The instrument used to measure atmospheric pressure is

A. Pyrometer

B. Eudiometer

C. Barometer

D. Hydrometer

What is the correct answer?

4

A convex mirror always produces

A. an erect, virtual image of diminished size

B. an erect, real image of diminished size

C. an erect, real image of double size

D. a virtual image of double size

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

A tube light works on the principle of

A. chemical, heating and magnetic effects of electricity

B. discharge of electricity through gases

C. the action of ultraviolet radiation on certain fluorescent materials

D. Both (b) and (c) above

What is the correct answer?

4

The red colour of the setting sun is due to

A. the least scattered red colour reaching the eye

B. the dispersion of sun light occurred in air molecule in atmosphere

C. the diffraction of sunrays in atmospheric layers

D. interference of all the rays coming from the sun

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

The evaporation rate depends on

A. the nature of the liquid

B. area of the exposed surface of the liquid

C. temperature of air and of the liquid

D. All the above

What is the correct answer?

4

The first Indian Satellite launched from a Russian Cosmodrome on April 16, 1975 was named

A. Bhaskara

B. Insat I-A

C. Aryabhatta

D. SLV-l

What is the correct answer?

4

Out of the following which is an insulator?

A. Silver

B. Copper

C. Nichrome

D. Dry wood

What is the correct answer?

4

When two similar sources vibrate with slightly different frequencies, a regular rise and fall occurs in the loudness of tone. This phenomenon Is known as

A. doppler effect

B. beats

C. resonance

D. echo

What is the correct answer?

4

Nuclear fusion is a process in which

A. the atoms and molecules lose their identity

B. nucleus is split into fragments

C. the nuclear reaction between two light atomic nuclei results in the formation of a heavier nucleus with release of a large quantity of nuclear energy in the process

D. absorption of neutron by a nucleus

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

Tea pots are highly polished

A. so that they may reflect thermal radiation from outside and minimise such radiation from them

B. so that they may absorb all radiation from outside

C. to make them attractive to look at

D. because they take high polish

What is the correct answer?

4

The focal length or lens or the eye is under the control or the

A. iris

B. pupil

C. ciliary body

D. cornea

What is the correct answer?

4

Which of the following wires of same dimensions offers least resistance to the ,flow of current?

A. copper

B. aluminium

C. silver

D. nichrome

What is the correct answer?

4

A small bubble of air deep down in a lake rises up to the top of the lake. The volume of the bubble on coming up will

A. increase

B. decrease

C. will not change

D. first increase and then decrease

What is the correct answer?

4

Photocells are used

A. in burglar alarms

B. in automotive devices for light switches

C. television cameras

D. All the above

What is the correct answer?

4

Less dew is formed on cloudy nights because

A. there is no moisture in the atmosphere

B. clouds absorb the falling dew

C. objects emit radiant energy very fast on such nights

D. objects lose less radiant energy

What is the correct answer?

4

The attraction between similar molecules is called

A. inertia

B. adhesion

C. cohesion

D. friction

What is the correct answer?

4

A bullet is fired at a certain angle with the horizontal. Its path will be

A. elliptical

B. a straight line

C. a parabola

D. a vertical line