1
NEET 2018
MCQ (Single Correct Answer)
+4
-1
The efficiency of an ideal heat engine working between the freezing point and boiling point of water, is
A
26.8%
B
20%
C
6.25%
D
12.5%
2
NEET 2018
MCQ (Single Correct Answer)
+4
-1
A sample of 0.1 g of water at 100°C and normal pressure (1.013 × 105 N m–2) requires 54 cal of heat energy to convert to steam at 100°C. If the volume of the steam produced is 167.1 cc, the change in internal energy of the sample, is
A
104.3 J
B
208.7 J
C
42.2 J
D
84.5 J
3
NEET 2018
MCQ (Single Correct Answer)
+4
-1
The volume (V) of a monatomic gas varies with its temperature (T), as shown in the graph. The ratio of work done by the gas, to the heat absorbed by it, when it undergoes a change from state A to state B, is NEET 2018 Physics - Heat and Thermodynamics Question 19 English
A
$${2 \over 5}$$
B
$${2 \over 3}$$
C
$${1 \over 3}$$
D
$${2 \over 7}$$
4
NEET 2018
MCQ (Single Correct Answer)
+4
-1
At what temperature will the rms speed of oxygen molecules become just sufficient for escaping from the Earth’s atmosphere?
(Given : Mass of oxygen molecule (m) = 2.76 × 10–26 kg, Boltzmann’s constant kB = 1.38 × 10–23 J K–1)
A
2.508 × 104 K
B
8.360 × 104 K
C
5.016 × 104 K
D
1.254 × 104 K
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