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

The relative errors in the measurement of two lengths 1.02 cm $$\pm$$ 0.01 cm and 9.89 cm $$\pm$$ 0.01 cm is

A
$$\pm$$1% and $$\pm$$0.1%
B
$$\pm$$1% and $$\pm$$0.2%
C
$$\pm$$1% and $$\pm$$1%
D
$$\pm$$0.1% and $$\pm$$1%
2
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

In Young's double slit experiment with sodium vapour lamp of wavelength 589 nm and slit 0.589 mm apart, the half angular width of the central maxima is

A
$${\sin ^{ - 1}}(0.01)$$
B
$${\sin ^{ - 1}}(0.0001)$$
C
$${\sin ^{ - 1}}(0.001)$$
D
$${\sin ^{ - 1}}(0.1)$$
3
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 21 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
4
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

Carnot cycle of an engine is given below

COMEDK 2021 Physics - Heat and Thermodynamics Question 51 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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