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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.

211.

An ice cube has mass of 20 g at 5°C. Calculate the energy required to raise its temperature to 0°C. [Specific heat capacity of ice = 2.1 J/g°c]

     

A.

105 J

B.

100 J

C.

42 J

D.

210 J

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

212.

The following statements about a loudspeaker are correct except?

A.

its contains a permanent magnet

B.

sound signal converted to varying current signal enters the speech coil

C.

the current in the speech coil creates a magnetic force on the coil

D.

the magnetic force on the speech coil is uni-directional.

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

213.

A radioactive material has a half-life of 1.0 hour If 200.0 g of it was present at 6 a.m. on a certain day, how many grams will have decayed by 9 a.m. on the same day?

A.

175.0 g

B.

150.0 g

C.

100.0 g

D.

187.5 g

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

214.

An electric circuit consists of a resistor. a battery and a key. If the voltage of the battery is increased, there Would be an increase in the?

A.

current and resistance only

B.

current resistance and temperature

C.

current and temperature only

D.

resistance and temperature only

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

215.

A force of 10 N, acting continuously, increases the kinetic energy of an object from 20.J to 60 J. Find the distance moved by the object.

A.

200m

B.

40m

C.

4m

D.

400m

View answer & explanation

Correct answer is C

according to the work-energy theorem; Workdone = change in kinetic energy.

W = ∆ K.E

force x distance = K.E2−K.E2

10 x s = 60 - 20 

s = 4010 = 4m.


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