Thermal Properties of Matter Test

Result

Thermal Properties of Matter Test - 17

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Weekly Quiz Competition

Question 1
4 / -1

A black body is heated from 27°C to 927°C. The ratio of radiation emitted will be

A
1 : 4

B
1 : 8

C
1 : 16

D
1 : 256

Solution
Question 2
4 / -1

A bucket full of hot water is kept in a room. It cools from 75°C to 70°C in t₁ min, from 70°C to 65°C in t₂ min and from 65°C to 60°C in t₃ min. Then ,

A
t₁ < t₂ < t₃

B
t₁ = t₂ = t₃

C
t₁ < t₂ > t₃

D
t₁ > t₂ > t₃
Question 3
4 / -1

The following four wires of length L and radius r are made of the same material. Which of these will have the largest extension when the same tension is applied?

A
L = 40 cm, r = 0.20 mm

B
L = 100 cm, r = 0.5 mm

C
L = 200 cm, r = 1 mm

D
L = 300 cm, r = 1.5 mm.

Solution
Question 4
4 / -1

The relation between Young’s modulus (Y), modulus of rigidity (η) and poisson’s ratio (σ) is

A
Y=2 η (1 – σ)

B
Y=2 η (1 + σ)

C
Y= η(1– 2σ)

D
Y =2η(1+2 σ)
Question 5
4 / -1

A wire of length L and of area of cross-section A is stretched through a certain length l. If Y is Young’s modulus of the material of the wire, then the force constant of the wire is

A

B

C

D

Solution
Question 6
4 / -1

A uniformly tapering vessel shown in Fig., is filled with liquid of density 900 kg/m³. The force that acts on the base of the vessel due to liquid is (take g = 10 m/s²)

A
3.6 N

B
7.2 N

C
9.0 N

D
12.6 N

Solution
Question 7
4 / -1

An open vessel containing water is given a constant acceleration a in the horizontal direction. Then the free surface of water gets sloped with the horizontal at an angle θ, given by

A

B

C

D

Solution
Question 8
4 / -1

An ice block floats in a liquid whose density is less than water. A part of block is outside the liquid. When whole of ice has melted, the liquid level will

A
rise

B
go down

C
remain same

D
first rise then go down
Question 9
4 / -1

Fig. shows the vertical cross section of a vessel filled with a liquid of density ρ. The normal thrust per unit area on the walls of the vessel at point P, as shown will be

A
h ρ g

B
H ρ g

C
(H – h) ρ g

D
(H – h) ρ g cos θ
Question 10
4 / -1

Surface tension of a liquid is due to

A
gravitational force between molecules

B
electrical force between molecules

C
adhesive force between molecules

D
cohesive force between molecules