Heat Test

Result

Heat Test - 4

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

If 420 J of energy is supplied to 10 g of water, it will raise its temperature by nearly

A
1°C

B
4.7°C

C
10°C

D
42°C

Solution

Heat supplied is:
Heat = 420 J = mC_pΔT

C_p = 4.2 J/g°C
m= 10g

420 = (4.2)(10)ΔT
△T = 10°C
Question 2
1 / -0

Latent heat of fusion of any body

A
is dependent on pressure

B
is dependent on volume

C
is always the same

D
varies under different conditions

Solution

Latent heat of fusion of any body is always the same.
Question 3
1 / -0

One gram of ice at 0⁰ C is mixed with 1 g of steam at 100⁰ C. Latent heat of fusion of water is 80 cal/g and latent heat of vaporisation is 536 cal/g. After thermal equilibrium is achieved, the temperature of the mixture is

A
100°C

B
55°C

C
75°C

D
0°C
Question 4
1 / -0

The efficiency of a heat engine can never be

A
10%

B
20%

C
40%

D
100%

Solution

The efficiency of a heat engine can never be 100%.
Question 5
1 / -0

Conversion of heat into electrical energy can be achieved by

A
transistor

B
voltmeter

C
thermocouple

D
photoelectric cell

Solution

A thermoelectric device for measuring temperature, consisting of two wires of different metals connected at two points, a voltage being developed between the two junctions in proportion to the temperature difference.
Question 6
1 / -0

Vapour pressure of a liquid depends upon

A
quantity of heat

B
temperature of liquid

C
specific heat of liquid

D
density of liquid

Solution

Vapour pressure of a liquid depends upon the temperature of a liquid.
Question 7
1 / -0

If water at 0^oC, kept in a container with an open top, is placed in a large evacuated chamber,

A
all the water will vapourise

B
all the water will freeze

C
a part of the water will vapourise and the rest will freeze

D
ice, water and water vapours will be formed and reach equilibrium at the triple point

Solution

As the chamber is evacuated, the freezing point of water is lowered.
Due to its own internal energy, and coupled to the fact that there is vaccum, most of the water will evaporate away.
This will increase the pressure somewhat though by a negligible value.

Due to the high cohesion of water molecules, most of this vapour will freeze, releasing energy, thus melting ice or vapourising liquid water elsewhere.
Thus, ice, water and water vapour will be formed and reach equilibrium at the triple point.

Although nobody can be absolutely sure as to what will happen as this is a pure theoretical question because of the fact that neither have the conditions been specified nor can they be replicated.

However, this is the most logical and plausible answer and hence is correct.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Heat Test - 4

Result

Heat Test - 4

Score

-

Rank

-

SHARING IS CARING

Question 1

1°C

4.7°C

10°C

42°C

Solution

Question 2

is dependent on pressure

is dependent on volume

is always the same

varies under different conditions

Solution

Question 3

100°C

55°C

75°C

0°C

Question 4

10%

20%

40%

100%

Solution

Question 5

transistor

voltmeter

thermocouple

photoelectric cell

Solution

Question 6

quantity of heat

temperature of liquid

specific heat of liquid

density of liquid

Solution

Question 7

all the water will vapourise

all the water will freeze

a part of the water will vapourise and the rest will freeze

ice, water and water vapours will be formed and reach equilibrium at the triple point

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.