1
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

From the figure describing photoelectric effect, we may infer correctly that

COMEDK 2021 Physics - Dual Nature of Radiation Question 13 English

A
Na and Al both have the same threshold frequency
B
Maximum kinetic energy for both the metals depends linearly on the frequency
C
the stopping potential are different for Na and Al for the same change in frequency
D
Al is better photosensitive material than Na
2
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

Carnot cycle of an engine is given below

COMEDK 2021 Physics - Heat and Thermodynamics Question 35 English

Total work done by the gas in one cycle is

A
$$\mu R{T_2}\log {{{V_2}} \over {{V_1}}} - \mu R{T_1}\log {{{V_3}} \over {{V_4}}}$$
B
$$\mu R{T_1}\log {{{V_2}} \over {{V_1}}} - \mu R{T_2}\log {{{V_3}} \over {{V_4}}}$$
C
$$\mu R{T_1}\log {{{V_2}} \over {{V_1}}} + \mu R{T_2}\log {{{V_3}} \over {{V_4}}}$$
D
Zero
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