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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.

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821.

A quantity of hot water at 100^oC is added to 400g of water at 10^oC until the temperature of the mixture is 60^oC.
Calculate the mass of the hot water added. [Specific heat capacity of water =4200JKg^-1 K^-1]

A.

200g

B.

320g

C.

400g

D.

500g

View answer & explanation

Correct answer is D

Heat lost by hot water = Heat gained by cold water

M x 4200 x (100 - 60 = 0.4 x 4200 x (60 - 10)

4200m x 40 = 0.4 x 4200 x 50

40m = 0.4 x 50

m = $\frac{0.4 \times 50}{40}$ = 0.5kg

= 500g

822.

The diagram above illustrates a block ans tackle pulley system in which an effort E supports a load of 100.0N. If the efficiency of the machine is 75%, calculate the value of E

A.

22.2N

B.

38.0N

C.

67.0N

D.

75.0N

View answer & explanation

Correct answer is A

Given; VR = 6, e = 75%, MA = ?

e = $\frac{\text{MA}}{\text{VR}} \times \frac{100}{1}$

MA = $\frac{75 \times 6}{10}$

MA = $\frac{9}{2}$

MA = $\frac{L}{E} = \frac{100}{E}$

$\frac{9}{2} = \frac{100}{E}$

9E = 100

E = $\frac{200}{9}$

= 22.2N

823.

Water is unsuitable for use as a thermometric liquid because it

A.

expands unevenly between 0^oC and 40^oC

B.

has narrow temperature range

C.

has a concave meniscus

D.

msintsin s fixed density

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

824.

The crackling noise produced by aluminum roofing sheets on a house during a hot sunny day is a result of

A.

thermal equilibrium of the sheets

B.

conduction of heat by the sheets

C.

contraction of the sheets

D.

expansion of the sheets

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

825.

A body of mass 1000kg is released from a height of 10m above the ground. Determine its kinetic energy just before it strikes the ground .[g = 10ms^-2]

A.

10J

B.

10³J

C.

10⁴J

D.

10⁵J

View answer & explanation

Correct answer is D

Ke = mgh

Ke = Pe

$\frac{1}{2}$ MV² = mgh

Ke = 1000 x 10 x 10

Ke = 100000J

Ke = 10⁵J

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