1
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
A man is sitting in a train which is moving with a velocity of 60 km/h. His speed with respect to the train is
A
$${{10} \over 3}$$ m/s
B
60 m/s
C
infinite
D
zero
2
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Which one of the following is the SI unit of the thermal conductivity of a material?
A
Wm$$-$$1K$$-$$1
B
Wm/K
C
Wm$$-$$1/K$$-$$1
D
Js$$-$$1m$$-$$1K
3
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Which one of the following statements is not correct?
A
Conduction can occur easily in solids, less easily in liquids but hardly at all in gases.
B
Heat energy is carried by moving particles in a convection current.
C
Heat energy is carried by electromagnetic waves in radiation.
D
The temperature at which a solid changes into a liquid is called the boiling point.
4
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
The resistance of a wire of length l and area of cross-section a is x $$\Omega$$. If the wire is stretched to double its length, then its resistance would become
A
2x $$\Omega$$
B
0.5x $$\Omega$$
C
4x $$\Omega$$
D
6x $$\Omega$$
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