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.

1,451.

The external parts of an object can be measure accurately through the use of which scientific instrument?

A.

Micrometer screw gauge

B.

Vernier Caliper

C.

Meter rule

D.

None of the instrument

Correct answer is B

Vernier calliper is used to measure the internal and external diameter of an object

1,452.

What is the relationship mechanical advantage (MA) velocity Ratio (V.R) and efficiency with percentage?

A.

e = M.A/V.R × 100 %

B.

M.A = E.V.R

C.

V.R = 1 ÷ sin θ M.A

D.

M.A = 1/E × 100%

Correct answer is A

The relationship between M.A, V.R, e and 100% can be written as

e = M.A/V.R × 100 %

i.e E/100 = M.A/V.R

= L ÷ E/x ÷ y = Ly/Ex

E/100 = Ly/Ex

1,453.

Electrons were discovered by

A.

James Chadwick B.

B.

J.J Thompson

C.

Sir Isaac Newton

D.

Charles Newton

Correct answer is B

J.J. Thompson discovered ELECTRONS

1,454.

Primary colours of light are

A.

Red, blue and green

B.

Cyan, magenta and yellow

C.

Black, blue and green

D.

None of these colours

Correct answer is A

Primary colours of light are red, blue and green

Secondary colours of light are cyan, magenta and yellow

1,455.

Mr. F. Abioye observed his image through a plane mirror, kept at a distance 4.7m away from him in his room. At what distance is the image found from Abioye's eye?

A.

9.4m

B.

7.5m

C.

5.7m

D.

6.9m

Correct answer is A

As object and image are usually at equal distance apart from the mirror /p>

Distance between Abioye (a) and hip image (I) = AI

i.e. AI = 4.7 + 47

= 9.4m