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
The moment of the force, $$\overrightarrow F = 4\widehat i + 5\widehat j - 6\widehat k$$ at
(2, 0, –3), about the point (2, –2, –2), is given by
A
$$ - 8\widehat i - 4\widehat j - 7\widehat k$$
B
$$ - 4\widehat i - \widehat j - 8\widehat k$$
C
$$ - 7\widehat i - 8\widehat j - 4\widehat k$$
D
$$ - 7\widehat i - 4\widehat j - 8\widehat k$$
3
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
4
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
$${2 \over 7}$$
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