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.

2,431.

The area under a force-distance graph represents

A.

acceleration

B.

velocity

C.

power

D.

work

E.

momentum

Correct answer is D

No explanation has been provided for this answer.

2,432.

The equation PxVyTz = constant

A.

x = 0, y = 0, z = 1

B.

x = 1, y = 0, z = 0

C.

x = 1, y = 1, z = 0

D.

x = 1, y = 1, z = 1

E.

x = 1, y = 1, z = -1

Correct answer is E

No explanation has been provided for this answer.

2,433.

A magnetic needle is suspended first at the earth's north magnetic pole and then at a point on the magnetic equator. The respective angles between the needle and the horizontal are

A.

0o and 0o

B.

60o and 60o

C.

90o and 90o

D.

90o and 0o

E.

0o and 90o

Correct answer is D

No explanation has been provided for this answer.

2,434.

A high-resistance voltmeter reads 3.0V when connected across the terminals of a battery on open circuit and 2.6V when the battery supplies a current of 0.2A through a lamp. The resistance of lamp is

A.

2.00\(\Omega\)

B.

13.00\(\Omega\)

C.

0.52\(\Omega\)

D.

0.13\(\Omega\)

E.

1.50\(\Omega\)

Correct answer is B

IR = 2.6 and Ir = 0.4

0.2 x R = 2.6

R = 13.00\(\Omega\)

2,435.

A heater marked 50W will evaporate 0.005kg of boiling water in 50 seconds. The specific latent heat of vaporization of water in J/kg is

A.

5.0 x 106

B.

1.0 x 106

C.

2.5 x 106

D.

2.5 x 105

E.

5.0 x 105

Correct answer is E

Heat energy = Electrical energy

mL = power x time

0.005 x L = 50 x 50

L = 5 x 105J/kg