Home
Current Affairs January 2024

What is the correct answer?

4

The mass number and the atomic number of an element are X and Y respectively. The number oC neutrons in the atom of that element is

A. X

B. Y

C. X + Y

D. X Y

Correct Answer :

D. X Y


Related Questions

What is the correct answer?

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

What is the correct answer?

4

When an electric apparatus is fitted with a three core flexible lead the insulation on the three wires is distinctively coloured. The present international convention is

A. brown for earth, yellow for live, light blue for neutral

B. green for earth, yellow for live, brown for neutral

C. yellow for earth, green for live, brown for neutral

D. brown or red for live, light blue or black for neutral and green or yellow for earth

What is the correct answer?

4

Red Light is used as a dancer signal because

A. it is pleasing to the eye

B. it has a traditional colour

C. it is easily distinguishable

D. it is most sensitive to the human eye

What is the correct answer?

4

Photo-electric cells convert

A. electrical energy into light energy

B. light energy into electrical energy

C. light energy into heat energy

D. electrical energy into heat energy

What is the correct answer?

4

Halley's comet appears in the heavens once in

A. 40 years

B. 50 years

C. 76 years

D. 80 years

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

The speed of sound in a medium depends upon the properties of the medium such as

A. its density

B. its temperature

C. its elasticity

D. All the above

What is the correct answer?

4

A hydrogen bomb is based on

A. nuclear fusion

B. nuclear fission

C. Both (a) and (b) above

D. Neither (a) nor (b)

What is the correct answer?

4

Why is nuclear fusion also known as thermonuclear reaction?

A. Fusion converts nuclear energy into heat

B. Fusion demands conditions of extremely high temperature to produce it

C. Fusion produces large amount of heat

D. Fusion reactions takes place in the sun

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 principle of equivalence of mass and energy was established by

A. Dalton

B. Rutherford

C. Einstein

D. Planck

What is the correct answer?

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

What is the correct answer?

4

The escape velocity of a satellite projected from the surface of the earth is independent of

A. the mass of earth

B. the mass of the satellite

C. the radius of the earth

D. gravitation of the earth

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

The method used to separate aluminium from a alumina is

A. electroplating

B. electrotyping

C. electrolysis

D. distillation

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 pair of stars that revolve round each other is

A. a neutron star

B. a binary star

C. a dwarf star

D. a polar star

What is the correct answer?

4

The brightest planet in the Solar System is

A. Jupiter

B. Mercury

C. Venus

D. Sirius

What is the correct answer?

4

Galaxies emit

A. radio waves and X-rays

B. ultraviolet light waves

C. visible light waves

D. All the above

What is the correct answer?

4

Commonly used safety fuse wire is made of

A. Tin

B. Lead

C. Nickel

D. An alloy of tin and lead

What is the correct answer?

4

The function of a ruse wire is

A. to stabilise the voltage

B. to decrease the current supply

C. to increase the current supply

D. to prevent an unduly high current from passing through a circuit

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

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

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

A device used in a ship for the purpose of measuring the depth of the sea is

A. an altimeter

B. a fathometer

C. a hydrometer

D. a sonometer

What is the correct answer?

4

The image of an object formed on the retina of the eye is

A. virtual and upright

B. virtual and inverted

C. real and inverted

D. real and upright

What is the correct answer?

4

The brightest star visible to the naked eye is

A. Sirius

B. Vega

C. Rigel

D. Proxima Centauri

What is the correct answer?

4

The star nearest to the sun is

A. Proxima Centauri

B. Sirius

C. Aldebaran

D. Vega

What is the correct answer?

4

A wire conveying a current deflects a pivoted magnetic needle. This was discovered by

A. Marconi

B. Oersted

C. Faraday

D. Ohm

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