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Current Affairs January 2024

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4

Rays from the headlight of a motor car are rendered parallel by suitably using

A. a convex mirror behind it

B. a concave lens behind it

C. a concave mirror in front of it

D. a concave mirror behind it

Correct Answer :

D. a concave mirror behind it


Related Questions

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4

Nuclear fission process means

A. absorption of a neutron by a nucleus

B. breakup of the nucleus of a heavy atom into two nearly equal halves emitting two or three neutrons and releasing large amounts of nuclear energy in the process

C. the scattering of neutrons

D. formation of heavier nucleus

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4

The asteroids belt lies between the orbits of

A. Earth and Mars

B. Venus and Earth

C. Mars and Jupiter

D. Moon and Mars

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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

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4

Why is it cool near an open pond on a hot summer day?

A. Evaporation at the surface causes cooling

B. The heat obsorbed at the surface is passed on to the bottom

C. Because of impurity in the water

D. Because of convection currents set up inside water

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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

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4

The loudness of a sound is determined by

A. Frequency

B. Amplitude

C. Speed

D. Wavelength

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4

The velocity of sound in air

A. increases as the square root of the absolute temperature

B. decreases with temperature

C. is independent of temperature

D. None of these

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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

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4

The maximum range of most TV signals is from 121 to 240 km only because

A. the curvature of earth limits the range of reception

B. the signals are weak

C. the signals are absorbed by air

D. the antennae are not powerful enough

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4

Formation of shadows can be explained by

A. rectilinear propagation of light

B. reflection

C. refraction

D. total internal reflection

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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

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4

A ship sailing from a river to the sea

A. sinks less in the sea

B. sinks more in the sea

C. neither sinks more nor less in the sea

D. sinking more or less depends on sea

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4

Choose the correct answer

A. Microphone converts sound energy into electrical energy.

B. Electric fan converts electrical energy into mechanical energy.

C. Battery converts chemical energy into electrical energy.

D. All the above

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4

In a freezer ice cubes will be formed more quickly in trays made of

A. rubber

B. plastic

C. aluminium

D. wood

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4

Out of the following which element has the longest half-life period?

A. Radium

B. Radon

C. Uranium-238

D. Plutonium

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4

A piece of cork is embedded inside an ice block which floats in water. What will happen to the level of water when all ice melts?

A. It will go down

B. It will come up

C. It will remain at the same level

D. First it will go down and it will come up

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4

Galaxies emit

A. radio waves and X-rays

B. ultraviolet light waves

C. visible light waves

D. All the above

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4

The velocity of sound in air increases with

A. the rise of temperature

B. rise of its frequency

C. decrease in humidity

D. fall of temperature

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4

The characteristics of a musical note are

A. loudness

B. pitch

C. quality or timbre

D. All the above

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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

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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

Solids have definite shapes. This is because

A. the forces of cohesion of the molecules within are very much less in them

B. the forces of cohesion are very large

C. the forces of adhesion are large

D. the forces of adhesion are less

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4

When a body is immersed in a fluid the force of buoyancy of the fluid on the body depends on

A. the immersed volume of the body

B. density of the liquid

C. acceleration due to the gravity at the place

D. All the above

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4

A device used to measure heights above sea level is known as

A. altimeter

B. anemometer

C. dilatometer

D. potentiometer

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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

Halley's comet appears in the heavens once in

A. 40 years

B. 50 years

C. 76 years

D. 80 years

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4

Echoes are produced by

A. the reflection of sound waves

B. the refraction of sound waves

C. the interference of sound waves

D. reverberation of sound waves

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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

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4

The SI unit of electric current is

A. the ampere

B. the volt

C. the ohm

D. the coulomb

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4

The device for tracking and locating the position of a moving object in space is called

A. Space ship

B. Lunar module

C. Radar

D. Rocket