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.

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2,561.

A metal block of mass 5kg lies on a rough horizontal platform. If a horizontal force of 8N applied to the block through its center of mass just slides the block on the platform, then the coefficient of limiting friction between the block and platform is

0.16

0.63

0.80

1.60

2.00

View answer & explanation

Correct answer is A

F = \(\mu\)R

= \(\mu\)mg

8 = \(\mu\) x 5 x 10

\(\mu\) = 0.16

2,562.

A block of mass 2.04kg resting on a smooth horizontal plane is acted upon simultaneously by two-forces, 10N due North and 10N due East. The magnitude of the acceleration produced by the force on the block is

0.10ms^-2

7.07ms^-2

10.00ms^-2

14.10ms^-2

20.00ms^-2

View answer & explanation

Correct answer is B

R = \(\sqrt {10^2 + 10^2}\)

R = 14.14N

R = F = ma

14.14 = 2 x a

a = 7.07ms^-1

2,563.

If a car starts from rest and moves with a uniform acceleration of 10ms^-2 for ten seconds, the distance it covers in the last one second of its motion is

95m

100m

500m

905m

1000m

View answer & explanation

Correct answer is A

Distance in 105, using, x = ut + \(\frac{1}{2}\)at²

x = (0 x 10) + (\(\frac{1}{2}\) x 10 x 10 x 10) = 500m

distance in 9s; x - (0 x 9) + (\(\frac{1}{2}\) x 10 x 9 x 9) = 405m

distance in last is = difference

= 500 - 405

= 95m

2,564.

Which of the following types of motion are oscillatory?

i.a diving board when used by a diver.
ii. the motion of the balance wheel of a wrist watch.
iii. the motion of the turn-table of a record player.
iv. the motion of the center of a ten kobo piece as it rolls down an inclined plane.
v. the motion of the needle of a D.C. ammeter into which a low A.C. current is passed

i and ii

i, ii and iii

ii, ii and iv

iii, iv and iv

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

2,565.

Which of the following statements are true about the spring balance and the chemical balance?

i. both are used to measure the mass of an object.
ii. either of them may be used to measure the weight of an object.
iii. the spring balance works on the principle of Hooke's law while the chemical balance works on the principle of moments.
iv. a change in gravity does the readings of a spring balance but not that of a chemical balance.

i, and iv

ii and iii

ii and iv