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1
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.
2
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 $$\Omega$$
3
NDA 2016 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Which one of the following statements is not correct?
A
The longest wavelength of light visible to human eye is about 700 nm.
B
The shortest wavelength of light visible to human eye is about 400 nm.
C
The wavelength of gamma rays is longer than that of X-rays.
D
The ability of a telescope to form separable images of close objects is called its resolving power.
4
NDA 2016 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
If the image of an object formed by a concave mirror is virtual, erect and magnified, then the object is placed
A
at the principal focus
B
at the centre of curvature
C
beyond the centre of curvature
D
between the pole of the mirror and the principal focus
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