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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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3,681.

The above figure shows the motion of a progressive wave along a string. The particle motion of the medium is in direction?

parallel to OX

parallel to OY

60^o to OX

60v to OY

View answer & explanation

Correct answer is B

Particles of the transmitting medium in transverse wave oscillate in a direction perpendicular to the propagation of the wave

3,682.

The diagram above is the heating curve for a solid, QR is the?

melting region

boiling region

sublimation region

evaporating process

View answer & explanation

Correct answer is A

At melting point there is no change temperature

3,683.

The efficiency of the pulley system shown above is 80%. find the effort E required to lift the load of 1200N

275N

325N

375N

573N

View answer & explanation

Correct answer is C

VR = No. of pulleys = 4
Efficiency = $\frac{M.A}{V.R}$

cross multiply

$\frac{80}{10} * V.R$ = M.A

$\frac{80}{10} * 4$ = M.A
M.A = 3.25
where M.A = $\frac{load}{effort}$
∴ Effort = $\frac{1200}{3.2} * V.R$

= 375N

3,684.

The diagram above shows a plank RS pivoted its center of gravity O and is in equilibrium with the weight P and Q. If a weight 2P is added to P the plank will be in equilibrium again by?

moving Q nearer to O

moving P nearer to O

addding a weight Q to Q

moving P further away from O

View answer & explanation

Correct answer is B

If 2P is added P, the beam will bend at R side. So to keep it in equilibrium. P should be moved nearer to 0

3,685.

A body of mass 4 kg resting on a smooth horizontal plane is simultaneously acted upon by two perpendicular forces 6N and 8N. Calculate the acceleration of the motion

2.5 ms^-1

3.0 ms^-1

4.0 ms^-1

4.5 ms^-1

View answer & explanation

Correct answer is A

Smooth plane has negligible friction
∴ only the resultant of the perpendicular forces is acting on the body, which is given as
F =
√ 82 + 62

=
√ 64 + 36

=
√ 100

= 10N
But F = Ma
∴ a = F/M = 10/4 = 2.5 ms-1