EWT | Academic Question

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Question (21)
QN0038735

When the zero of the circular scale of a screw gauge coincides with the zero of the main scale before A and B come in contact then the instrument has

  • (A)

    positive zero error

  • (B)

    negative zero error

  • (C)

    no zero error

  • (D)

    can't be said anything

Correct Answer: B
Explanation:

The instrument has negative zero error.

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Question (22)
QN0038736

The specific heat of a solid is determined by the method known as the method of

  • (A)

    fusion

  • (B)

    vaporisation

  • (C)

    mixture

  • (D)

    cooling

Correct Answer: B
Explanation:

The specific heat of a solid is determined by the method of mixture.

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Question (23)
QN0038737

Which principle is involved in the experiment to determine the specific heat of a liquid by the method of mixture?

  • (A)

    Heat gained by solid = Heat lost by colorimeter and liquid.

  • (B)

    Heat lost by solid = Heat gained by calorimeter and liquid.

  • (C)

    Heat lost by solid and liquid  Heat gained by calorimeter.

  • (D)

    Heat gained by solid and calorimeter = Heat lost by liquid.

Correct Answer: A
Explanation:

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Question (24)
QN0038738

Consider the following statements regarding the experiment to the determine the velocity of sound in laboratory by resonance tube method.

1.The first resonance is obtained for the length  of the air column.

2.The second resonance is obtained for the length  of the air column.

If  be the frequency of the tuning fork then which is the correct relation (  represents the velocity of sound)?

  • (A)

  • (B)

  • (C)

  • (D)

Correct Answer: C
Explanation:

The velocity of sound is given by

Here, and

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Question (25)
QN0038739

Which of the following is not correct regarding the experiment to determine the velocity of sound in laboratory by resonance tube method?

  • (A)

    The resonance tube apparatus should be kept inclined.

  • (B)

    The tuning fork should be struck gently against a soft rubber pad.

  • (C)

    The vibrating tuning fork should be held horizontally over the open end of the tube.

  • (D)

    The prongs of vibrating tuning fork should not touch the tube.

Correct Answer: A
Explanation:

The apparatus should be kept vertical not inclined.

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Question (26)
QN0038740

Which one of the following precautions is wrong regarding the experiment to determine the specific heat of a solid ?

  • (A)

    Sufficient water should be taken in hypsometer.

  • (B)

    Solid should be dropped slowly but gently without splashing water in calorimeter.

  • (C)

    Temperature of cold water should not be below the dew point.

  • (D)

    Final temperature of the mixture should be noted after thorough stirring.

Correct Answer: B
Explanation:

Solid should be dropped quickly and not slowly.

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Question (27)
QN0038741

Two spheres of radii  and  is dropped through a tube full of glycerine. Their terminal velocities  and  are calculated in the experiment. Which of the following is true?

  • (A)

  • (B)

  • (C)

  • (D)

    and  are independent of  and 

Correct Answer: B
Explanation:

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Question (28)
QN0038742

A student is performing the experiment of resonance column. The diameter of the column tube is . The frequency of the tuning fork is . The air temperature is  in which the speed of sound is . The zero of the meter scale coincides with the top end of the resonance column tube. When the first resonance occurs, the reading of the water level in the column is

  • (A)

  • (B)

  • (C)

  • (D)

Correct Answer: B
Explanation:

Considering the end correction , we get

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Question (29)
QN0038743

What happens when we do not stir the mixture continuously in the experiment to determine the specific heat capacity of a given solid ?

  • (A)

    Temperatue of mixture is increased

  • (B)

    Temperature of mixture is not constant

  • (C)

    Temperature of mixture is constant

  • (D)

    None of these

Correct Answer: B
Explanation:

If temp of mixture (  ) is not constant then according to calculation we find wrong value of specific heat. If we stir continuously then temperature of whole mixture becomes same.

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Question (30)
QN0038744

A vernier angle measurement is constructed with main scale divisions  apart and  vernier division match with  main scale division then least count is

  • (A)

  • (B)

  • (C)

  • (D)

Correct Answer: D
Explanation:

L.C.

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