81)

The discovery and understanding of electromagnetic induction is based on a long series of experiments carried out by ______.

SSC CPO 2020

A)

Rutherford

B)

Einstein

C)

Faraday and Henry

D)

Planck and Fermi

82)

Electrical conductance through metals is called electronic conductance and it ______.

SSC CPO 2020

A)

decreases with increase in temperature

B)

increases with increase in temperature

C)

decreases with decrease in temperature

D)

does not depend on temperature

83)

One calorie of heat energy is equivalent to approximately ______ joules of mechanical energy.

SSC CPO 2020

A)

0.24

B)

4.2

C)

0.48

D)

2.4

84)

30̊ Celcius = ______ Kelvin (approximately)

SSC CPO 2020

A)

- 243

B)

- 30

C)

130

D)

303

85)

‘mho’ is the unit of ______ of a substance.

SSC CPO 2020

A)

conductance

B)

resistivity

C)

conductivity

D)

resistance

86)

______ waves include visible light waves, X-rays, gamma rays, radio waves, microwaves, ultraviolet and infrared waves.

SSC CPO 2020

A)

Electromagnetic

B)

Mechanical

C)

Electric

D)

Magnetic

87)

______ is a naturally occurring phenomenon that is responsible for the heating of the Earth’s surface and atmosphere.

SSC CPO 2020

A)

Greenhouse effect

B)

Global heating

C)

Radiation

D)

Global warming

88)

______ are also known as heat waves.

SSC CPO 2020

A)

X-rays

B)

Gamma rays

C)

Light waves

D)

Infra-red waves

89)

In a galvanic cell, the half-cell in which oxidation takes place is called ______ and it has a negative potential with respect to the solution.

SSC CPO 2020

A)

anode

B)

diode

C)

triode

D)

cathode

90)

The phenomenon of deviation of light rays from their original path, when they pass from one medium to another, is called ______.

SSC CPO 2020

A)

diffraction

B)

obstruction

C)

refraction

D)

reflection