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Current Affairs January 2024

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4

To produce beats it is necessary to have two waves

A. travelling in opposite direction

B. of slightly different frequencies

C. of equal wavelength

D. of equal amplitude

Correct Answer :

B. of slightly different frequencies


Related Questions

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4

The radius of curvature of a spherical mirror is

A. equal to half its focal length

B. equal to its focal length

C. twice its focal length

D. not related to its focal length

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4

When a particle in motion is acted upon by a force in a direction perpendicular to the direction of motion, the path followed by the particle will be

A. a straight line

B. an ellipse

C. a circle

D. a parabola

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4

When are temperature resistance

A. increases

B. decreases

C. remains the same

D. first increases then decreases

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4

It is difficult to bon potatoes at the top or a mountain because

A. the water available is hard

B. it is colder than at sea level

C. the potatoes become hard

D. the boiling point of water is lower at that height on account of low atmospheric pressure

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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

A cyclist leans inwards when he is negotiating a curve 10 that

A. he may increase his speed

B. his weight may be reduced

C. necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion

D. no frictional force may be produced between the wheels and the axle

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4

For detecting and, testing of small electric charges we use

A. an electrophorus

B. an electroscope

C. an electromagnet

D. an ammeter

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4

Cosmic rays contain

A. protons and electrons

B. alpha particles

C. gamma rays

D. All the above

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4

The Indian Satellite System used for domestic communications, television and meteorology is known as

A. INSAT

B. Bhaskara

C. Aryabhatta

D. All the above

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4

Which of the following has the highest refractive index?

A. Crown glass

B. Water

C. Flint glass

D. Diamond

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4

The planet that has got a well-developed set of rings is

A. Venus

B. Saturn

C. Mercury

D. Earth

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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

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

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4

Photoelectric cell is a device which converts

A. light energy into electrical energy

B. electrical energy into light energy

C. magnetic energy into electrical energy

D. electrical energy into mechanical energy

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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

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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

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4

The Space Application Centre for training in Satellite Communication Technology is located at

A. Bangalore

B. Mumbai

C. Ahmedabad

D. New Delhi

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4

Like magnetic poles

A. attract each other

B. repel each other

C. neither attract nor repel

D. attract or repel depending upon the conditions

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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

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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

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4

A rod of brass la held in hand and rubbed with fur. The rod is found to have

A. no charge

B. positive charge

C. negative charge

D. can't be said

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4

Increase in pressure

A. increases the melting point of ice

B. decreases the melting point of ice

C. has no effect on the melting point of ice

D. increases the volume of the ice

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4

In a longitudinal wave, the direction of propagation of the wave is

A. the same as the direction of the vibrations of the vibrating body

B. at right angles to the direction of the vibrations of the vibrating body

C. Both (a) and (b) above

D. None of the above

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4

For detecting and, testing of small electric charges we use

A. an electrophorus

B. an electroscope

C. an electromagnet

D. an ammeter

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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

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4

A bucket of water is hung from a spring balance. A piece of iron is suspended in the water without touching the sides or touching the bottom of the bucket. The reading of the spring balance

A. will increase

B. will decrease

C. does not change

D. varies with the increase of depth of the immersion of the iron piece

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4

The nuclear model of atom was first visualised by

A. Rutherford

B. Neils Bohr

C. Albert Einstein

D. JJ Thompson

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4

Hot water is poured simultaneously in four metallic tumblers painted outside with different paints. After some time the water will be found to have cooled most in the tumbler painted.

A. rough white

B. rough black

C. shining white

D. shining black

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4

The instrument used to determine the RD (Relative Density) of a liquid by the principle of floatation is

A. Hygrometer

B. Hypsometer

C. Hydrometer

D. Densimeter

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4

The unit of power in SI is

A. Joule

B. Newton

C. Joule/Sec

D. Erg/Sec