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.

2,556.

The areas of the effort and load pistons of a hydraulic press are 0.5m2 and 5m2 respectively. If a force F1 of 100N is applied on the effort piston, the force F2 on the load is

A.

10N

B.

100N

C.

500N

D.

1000N

E.

5000N

Correct answer is D

\(\frac{load}{area}\) = \(\frac{effort}{area}\)

\(\frac{load}{5}\) = \(\frac{100}{0.5}\)

load = 1000N

2,557.

A force of 100N stretches an elastic string to a total length of 20cm. If an additional force of 100N stretches the string 5cm further, Find the natural length of the string

A.

15cm

B.

12cm

C.

10cm

D.

8cm

E.

5cm

Correct answer is A

Using, f1 = f2

e1 = 20 - L ; e2 = 5cm

\(\frac{f_1}{e_1}\) = \(\frac{f_2}{e_2}\)

\(\frac{100}{20 - L}\) = \(\frac{100}{5}\)

hence, L = 15cm

2,559.

Two masses 40g and 60g respectively, are attached firmly to the ends of the light meter rule. The center of gravity of the system is

A.

at the mid-point of the meter rule

B.

40cm from the lighter mass

C.

40cm from the heavier mass

D.

60cm from the heavier mass

E.

indeterninate because the meter-rule is light

Correct answer is C

No explanation has been provided for this answer.

2,560.

Which of the following is NOT a force?

A.

Friction

B.

Tension

C.

Upthrust

D.

Weight

E.

Impulse

Correct answer is E

No explanation has been provided for this answer.