Engineering Physics I Mock Test 4

10%

Question 1 of 10

1. If 1g of steam is mixed with 1g of ice, what is the resultant temperature of the mixture?

100°

230°

50°

270°

Question 1 of 10

Question 2 of 10

2. Assertion: A needle placed carefully on the surface of the water may float, whereas a ball of the same material will always sink.
Reason: The buoyancy of an object depends both on the material and shape of the object

Assertion and reason is false

Both assertion and reason are true but the reason is not the correct explanation of the assertion

Assertion is true but the reason is false

Both assertion and reason are true and the reason is the correct explanation of the assertion

Question 2 of 10

Question 3 of 10

3. A black body is at 727°C. It emits energy at a rate, which is proportional to ___________

(1000)²

(1000)⁴

(727)²

(727)⁴

Question 3 of 10

Question 4 of 10

4. Temperature is a microscopic concept.

True

False

Question 4 of 10

Question 5 of 10

5. Calculate the Young’s modulus in the cantilever depression method. The length is 1m which is suspended with a load of 150gm. The depression is found to be 4cm. The thickness of the beam is 5mm and breadth is 3cm.

1.245 ×10¹⁰ N/m²

3.92 × 10¹⁰ N/m²

9000 × 10¹⁰ N/m²

4000 × 10¹⁰ N/m²

Question 5 of 10

Question 6 of 10

6. Which type of elasticity is involved in tangential push on the upper face of a block?

Bulk modulus

Young’s modulus

Elastic limit

Rigidity modulus

Question 6 of 10

Question 7 of 10

7. A constant pressure air thermometer gave a reading of 47.5 units of volume, when immersed in ice-cold water, and 67 units in a boiling liquid. What is the boiling point of the liquid?

112°C

125°C

135°C

100°C

Question 7 of 10

Question 8 of 10

8. What is the effect of hammering on elasticity of materials?

Has no effect on elasticity

Decreases the elasticity

Increases the elasticity

Breaks the material

Question 8 of 10

Question 9 of 10

9. Assertion: For higher temperatures, the peak emission wavelength of a black body shifts to lower wavelengths.
Reason: Peak emission wavelength of black body is proportional to the fourth power of temperatures.

Both assertion and reason are false

Assertion is true but the reason is false

Both assertion and reason are true but the reason is not a correct explanation of the assertion

Both assertion and reason are true and the reason is the correct explanation of the assertion

Question 9 of 10

Question 10 of 10

10. A given quantity if an ideal gas is at pressure P and absolute temperature T. What is the isothermal bulk modulus of the gas?

3P/2

2P/3

Question 10 of 10