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.

3,417.

Which of the following have the greatest penetrating power?

A.

Beta rays

B.

Alpha rays

C.

Gamma rays

D.

Electrons

E.

Neutrons

Correct answer is C

No explanation has been provided for this answer.

3,419.

A point charge of 1.0 x 10-7 C experiences force of 0.01 N in a uniform electric field. Calculate the magnitude of the strength of the field

A.

106 Vm-1

B.

105 Vm-1

C.

10-5 Vm-1

D.

102 Vm-1

E.

109 Vm-1

Correct answer is B

F = qE

E =
F/q
=
0.01/1.0 x 10-7
= 105Vm-1

3,420.

In a purely resistive a.c. circuit, the current I = Io sin wt and voltage, V = Vo sin wt. Calculate the instantaneous power dissipated in the circuit in time t.

A.

Io Vo

B.

2Io Vosin wt

C.

(Io Vo)/2

D.

Io Vo sin2wt

E.

I2o V2o

Correct answer is D

No explanation has been provided for this answer.