1
MHT CET 2021 23th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

Which one of the following statements is wrong for an isobaric process?

A
The pressure of the system remains constant
B
There is change in volume, when work is done
C
Temperature of the system remains constant
D
Energy exchanged is used to do work to change internal energy
2
MHT CET 2021 23th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

For a perfectly black body, coefficient of emission is

A
zero
B
infinity
C
unity
D
less than one (non-zero)
3
MHT CET 2021 23th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

Two rods of different metals have coefficients of linear expansion '$$\alpha_1$$' and '$$\alpha_2$$' respectvely. Their respective lengths are '$$\mathrm{L}_1$$' and '$$\mathrm{L}_2$$'. At all temperatures ($$\mathrm{L}_2-\mathrm{L}_1$$) is same. The correct relation is

A
$$\mathrm{L}_1 \alpha_1^2=\mathrm{L}_2 \alpha_2^2$$
B
$$\mathrm{L}_1^2 \alpha_1^2=\mathrm{L}_2^2 \alpha_2^2$$
C
$$\mathrm{L}_1 \alpha_2=\mathrm{L}_2 \alpha_1$$
D
$$\mathrm{L}_1 \alpha_1=\mathrm{L}_2 \alpha_2$$
4
MHT CET 2021 23th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

The temperature of a black body is increased by $$50 \%$$, then the percentage increase in the rate of radiation by the body is approximated

A
50%
B
100%
C
400%
D
150%
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