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Physics questions and answers

Physics Questions and Answers

If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.

3,696.

The bond between silicon and germanium is

A.

covalent

B.

ionic

C.

dative

D.

electrovalent

Correct answer is A

No explanation has been provided for this answer.

3,697.

Which of the following materials has an increase in resistance with temperature?

A.

water

B.

metals

C.

wood

D.

electrolyte

Correct answer is B

Resistance in metals are proportional to temperature

3,698.

Two inductors of inductance 4 II and 8 II are arrange in series and a current of 10 A is passed through them. What is the energy stored in them?

A.

600 J

B.

50 J

C.

133 J

D.

250 J

Correct answer is A

Inductance (L) in series: 4 + 8 = 12

Therefore Energy stored =  

W = 12LI2

= 12×12×102

= 600J

3,699.

Under which of the following conditions do gases conduct electricity?

A.

Low presssure and low p.d

B.

low pressure and high p.d

C.

high pressure an low p.d

D.

high pressure and high p.d

Correct answer is B

Under high potential difference and low pressure gases are good conductor of electricity

3,700.

If the charge of electricity in Kwh is N4, what is the cost of operating an electrical appliance rated 250 v, 2A for six hours?

A.

N28

B.

N12

C.

N16

D.

N24

Correct answer is B

Energy consumed = power x time = lvt = 2 x 250 x 6hr = 300 wh = 3 kwh but 1 kwh = N4
3 kwh = 3 x N4 = N 12