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.

2,721.

The total energy required to send a unit positive charge round a complete electrical circuit is the

A.

kinetic energy

B.

potential difference

C.

electromotive force

D.

electrical energy

Correct answer is B

No explanation has been provided for this answer.

2,722.

When a known standard resistor of 2\(\Omega\) is connected to the 0.0cm end of a meter bridge, the balance point is found to be at 55.0cm. What is the value of the unknown resistor?

A.

1.10\(\Omega\)

B.

1.64\(\Omega\)

C.

2.44\(\Omega\)

D.

27.50\(\Omega\)

Correct answer is B

\(\frac{R_1}{R_2}\) = \(\frac{L_1}{R_2}\)

\(\frac{2}{R_2}\) = \(\frac{55}{45}\)

R = 1.64\(\Omega\)

2,723.

Three cells each of e.m.f. 1.5v and an internal resistance of 1.0\(\Omega\) are connected in parallel across a load resistance of 2.67\(\Omega\). Calculate the current in the load?

A.

0.26A

B.

0.41A

C.

0.50A

D.

0.79A

Correct answer is C

E = 1.5v

rT = \(\frac{1 \times 1\times 1}{(1\times1)+ (1\times1) +(1\times1)}\)

E.m. f = I(R + r) = 0.33\(\Omega\)

1.5 = I(2.67 + 0.33)

I = 0.5A

2,724.

Which of the following is a vector?

A.

Electric charge

B.

Electric field

C.

Electrical potential difference

D.

Electrical capacitance

Correct answer is B

No explanation has been provided for this answer.