11)

Standing in an open ground on a cloudless day, at what time will your shadow be the shortest?

SSC CPO 2020

A)

15:00

B)

07:00

C)

12:00

D)

09:00

12)

A set of equations involving electric and magnetic fields, and their sources, the charge and current densities are known as ______ equations.

SSC CPO 2020

A)

Newton’s

B)

Bhor’s

C)

Einstein’s

D)

Maxwell’s

13)

The charge has to be passed ______ to obtain maximum work from a galvanic cell.

SSC CPO 2020

A)

uniformly

B)

inversely

C)

proportionately

D)

reversibly

14)

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

15)

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

16)

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

17)

30̊ Celcius = ______ Kelvin (approximately)

SSC CPO 2020

A)

- 243

B)

- 30

C)

130

D)

303

18)

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

SSC CPO 2020

A)

conductance

B)

resistivity

C)

conductivity

D)

resistance

19)

______ 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

20)

______ 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