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Current Affairs January 2024

What is the correct answer?

4

Choose the scalar quantity from the following physical quantities

A. force

B. velocity

C. acceleration

D. speed

Correct Answer :

D. speed


Related Questions

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4

To get 5 images of a single object one should have two plane mirrors inclined at an angle of

A. 72°

B. 60°

C. 36°

D. 90°

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4

In the case of bodies falling under gravity which of the following remains constant at a given place?

A. kinetic energy

B. potential energy

C. acceleration

D. All the above

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4

X-rays were discovered by

A. Wilhelm Roentgen

B. WO Coolidge

C. Henry Cavendish

D. William Watson

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4

Sound waves in air are

A. transverse

B. longitudinal

C. transverse and longitudinal

D. neither transverse nor longitudinal

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4

A man stands in a lift which accelerates upwards. The resultant reaction force on the floor of the lift is

A. greater than the weight of the man

B. less than the weight of the man

C. same as the weight of the man

D. zero

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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

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4

The speed of light is minimum while passing through

A. air

B. glass

C. vacuum

D. water

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4

The filament lamp is an example for

A. fluorescence

B. incandescence

C. both (a) and (b)

D. None of these

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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

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4

Rays similar to X-rays but of smaller wave length that are given off by radioactive substances are

A. a -rays

B. � -rays

C. ? -rays

D. Cosmic rays

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4

An electric kettle used for boiling hard water has a white scale deposited on its heating element. This consists or

A. sugar

B. sodium carbonate

C. common salt

D. carbonates of calcium and magnesium

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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

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4

Electron-volt is a unit of

A. power

B. velocity

C. energy widely used in nuclear physics

D. number of electrons

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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

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4

The rocket engine is motivated by jet propulsion which uses the famous

A. Kepler's Laws

B. Newtonian Third Law of Motion

C. Bernoulli's Principle

D. Law of Relativity

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4

The mode of travel of heat energy from the sun across the empty space beyond the earth's atmosphere is known as

A. conduction

B. convection

C. radiation

D. absorption

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4

When light passes from air to glass, its velocity in glass

A. increases

B. decreases

C. remains unchanged

D. first decreases then increases

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4

A man stands in a lift which accelerates upwards. The resultant reaction force on the floor of the lift is

A. greater than the weight of the man

B. less than the weight of the man

C. same as the weight of the man

D. zero

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4

The cell that can be recharged, after it has run down, by passing a direct current through it from a source of current is

A. Voltaic cell

B. Leclanche cell

C. Dry cell

D. An accumulator

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4

The inability of a body to change its state of rest or uniform motion along a straight line is called its

A. momentum

B. velocity

C. acceleration

D. inertia

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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

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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

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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

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4

The heating element often used in an electric iron is

A. copper

B. tungsten

C. mica

D. nichrome

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4

Air pressure is usually highest when the air is

A. warm and moist

B. cool and dry

C. warm and dry

D. cool and moist

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4

Alternating Current (AC) is more advantageous than direct current because

A. it can be transmitted easily and efficiently

B. Alternating Current (AC) loses the least amount of energy when transmitted at high voltages

C. Alternating Current (AC) voltage can be easily increased or decreased

D. all the above

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4

Match the following:
A. Anemometer1. Measurement of power
B. Tachometer2. Wind speed
C. Dynamometer3. Revolutions per minute
D. Barometer4. Atmospheric pressure
*5. Current from a dynamo

A. A-1 B-3 C-5 D-4

B. A-2 B-1 C-3 D-4

C. A-2 B-3 C-1 D-4

D. A-1 B-3 C-5 D-2

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4

A cup of hot coffee is placed on a metal table in a room. By which of the following methods does it lose heat?

A. conduction and convection only

B. conduction and radiation only

C. convection and radiation only

D. conduction, convection and radiation

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4

Which part of the eye photographic camera?

A. Lens

B. Iris

C. Retina

D. Eyelid

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4

A spherical mirror is

A. a reflecting elliptical portion

B. a reflecting spherical surface

C. a parabolic reflecting surface

D. a flat reflecting surface