10 Question-answer on specific heat | Learn Physics

10 Question-answer on specific heat 

1.       Which of the following has the highest specific heat?

(a)    Copper

(b)   Water

(c)    Hydrogen

(d)   Silver

Ans: (c)

2.       The specific heat of ice at 0˚C melting into water at 0˚C is:

(a)    Zero

(b)   Infinity

(c)    More than zero

(d)   Less than zero

Ans: ( b)

3.       Water is used as a coolant because of its

(a)    Lower density

(b)   Easy availability

(c)    High specific heat

(d)   Low specific heat

Ans: (c )

4.       If temperature scale is changed from C to F, numerical value of specific heat will:

(a)    Increases

(b)   Decreases

(c)    Remains same

(d)   Cannot say

Ans: (b)

5.       Molar specific heat of monatomic gas at constant pressure is:

(a)    5R/2

(b)   3R/2

(c)    7R/2

(d)   R

Ans: (a)

6.       Molar specific heat at constant volume, for non linear triatomic gas is:

(a)    3R

(b)   4R

(c)    2R

(d)   R

Ans:(a)

7.       If 70 cals of heat is required to raise the temp. of 2 moles of an ideal gas at constant pressure from 30˚C to 35˚C, then the amount of heat required to raise the temp. of same gas through same range at constant volume is :

(a)    50 cal

(b)   70 cal

(c)    60 cal

(d)   65 cal

Ans: (a)

8.       Boiling water is changing into steam. The specific heat of boiling water is:

(a)    Zero

(b)   One

(c)    Infinity

(d)   Less than one

Ans: (c)

9.       In a pressure cooker, cooking is faster because the increase of vapour pressure

(a)    Increases specific heat

(b)   Decreases specific heat

(c)    Decreases the boiling point

(d)   Increases the boiling point

Ans: (d)

10.       The specific heat of an ideal gas varies with temp. T as:

(a)    T

(b)   T²

(c)    T^-1

(d)   T⁰

                      Ans: (d)