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.

2,641.

A man walks 8km north and then 5km in a direction 60o east of north. Find the distance from his starting point

A.

11.36km

B.

12.36km

C.

13.00km

D.

14.36km

Correct answer is A

R = \(\sqrt {5^2 + 8^2 - 2 \times 5 \times 8 \times cos 120^o}\)

R = \(\sqrt{129}\)

= 11.36km

2,642.

A jet engine develops a thrust of 270Ns when the velocity of the exhaust gases relative to the engine is 300ms-1. What is the mass of the material ejected per second?

A.

81.00kg

B.

9.00kg

C.

0.90kg

D.

0.09kg

Correct answer is C

Thrust = force x time

thrust = \(\frac{m(v - u)}{t}\) x \(\frac{t}{1}\)

270 = m(300 - 0)

m = 0.90kg

2,643.

Which of the following units is equivalent to kgms-1?

A.

Ns-1

B.

Nms-1

C.

Ns

D.

Js-1

Correct answer is C

kgms-1 = \(\frac{mass}{distance}\)

since, F = ma = kgms-1 = N

kgms-1 = Ns

2,644.

Which of the following symbolic representations is correct for an atom X with 22 electrons and 43 neutrons?

A.

\(^{43}_{22}X\)

B.

\(^{22}_{43}X\)

C.

\(^{65}_{43}X\)

D.

\(^{65}_{22}X\)

Correct answer is D

No explanation has been provided for this answer.

2,645.

In a certain fusion reaction, a deuteron (\(^{2}_{1}H\)) interacts with a triton (\(^{3}_{1}He\)) and produces an a-particle (\(^{4}_{2}He\)) and a second product. The second product is

A.

a proton

B.

an electron

C.

a neutron

D.

a gamma ray

Correct answer is C

\(^{2}_{1}H\) + \(^{3}_{1}H\) \(\to\) \(^{4}_{2}He\) + \(^{1}_{0}He\)