Physics 2008 | Study Mode

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Question 11

When cold water is poured on a can containing hot water, the can collapses because the

A

steam condeses and occupies the partial vacuum in the can

B

external air pressure counter balances the pressure within the can

C

steam expands to occupy the vacuum remaining in the can

D

external pressure becomes greater than the pressure within the can.

Explanation

Share Answer Cold water reduces the temperature of the hot water inside the can causing the contraction of the hot water. This reduces the pressure inside the can and the can collapses due to the external greater expression.

Correct option: D

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Question 12

An empty density bottle weighs 2 N. if its weighs 5 N when filled with water and 4 N when filled with olive oil, the relative density of olive oil is

A

(1)/3

B

(2)/3

C

(1)/5

D

(2)/5

Explanation

Share Answer relative density = (weight of substance )/weight of equal volume of water = (4 - 2)/5 - 2 = (2)/3

Correct option: B

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Question 13

The thermometric properties of a thermocouple is the change in?

A

equivalent resistance

B

electromotive force

C

colour

D

pressure

Explanation

Share Answer Temperature difference between hot and cold junctions of thermocouple is proportional to the emf. generated

Correct option: B

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Question 14

During summer, the balance wheel of a clock expands.what effect does this have on the accuracy of the clock?

A

the clock gians time

B

the accuracy of the clock is not affected

C

the clock losses time

D

the clock stops working

Explanation

Share Answer The elastic potential energy of the balance wheel reduces as the wheel expands, therefore the clock will loose time.

Correct option: C

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Question 15

A sealed flask contains 600cm³ of air at 27C and is heated to 35C at constant pressure. The new volume is?

A

508 cm³

B

516 cm³

C

608 cm³

D

616 cm³

Explanation

Share Answer V₁ = 600cm₃, T₁ = 27 = 273 = 300k
T₂ = 35 + 273 = 308K, V₂ = ?
(V)₁/T₁
= (V)₂/T₂ = V₂
= (V)₁/T₁ x X T₂
= (600 X 308)/300 = 616 cm³

Correct option: D

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Question 16

A block of aluminum is heated electrically by a 25 W heater. if the temperature rises by 10C in 5 minutes, the heat capacity of the aluminum is?

A

850 JK^-1

B

750 JK^-1

C

650 JK^-1

D

500 JK^-1

Explanation

Share Answer Heat supplied = Heat gained
P x t = C
(25 x 5 x 60)/300 = 750 JK^-1

Correct option: B

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Question 17

If the partial pressure of water vapour at 27C is 18 mm Hg and the saturated vapour pressure of the atmosphere at the same temperature is 24 mm Hg, the relative humidity at this temperature is?

A

25%

B

33%

C

75%

D

82%

Explanation

Share Answer Relative
Humidity = (S.V.P. of water at dew point)/S.V.P of water at air temperature =(18)/24 x 100% = 75%

Correct option: C

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Question 18

In a good thermos flask, the main cause of heat loss is?

A

conduction through the cork

B

the plastic base of the thermos flask

C

the silvered walls and shiny metals

D

the outer cover or jacker

Explanation

Share Answer Since the cork is in contact with the walls of the flask, little conduction takes place

Correct option: A

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Question 19

Given the progressive wave equation y = 5 sin (2000 t - 0.4x), calculate wave length

A

12.4 m

B

15.7 m

C

17.5 m

D

18.6 m

Explanation

Share Answer Comparing y = 5sin (200 t - 0.4X) with the wave equation y = A sin (wt -KX) K = (2)/ = 0.4
= (2)/0.4 = 15.7M

Correct option: B

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Question 20

The fundamental property of a propagating wave which depends only on the source and not the medium of propagation is the?

A

wavelength

B

harmonies

C

frequency

D

velocity

Explanation

Share Answer Timber/ quality depends on the overtones or harmonics, and timber is a characteristic property of source of sound.

Correct option: B

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