NDA 2015 Paper 2 | Physics Question 24 | General Science

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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

2x $$\Omega$$

0.5x $$\Omega$$

4x $$\Omega$$

6x $$\Omega$$

NDA 2016 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

Which one of the following statements is not correct?

The longest wavelength of light visible to human eye is about 700 nm.

The shortest wavelength of light visible to human eye is about 400 nm.

The wavelength of gamma rays is longer than that of X-rays.

The ability of a telescope to form separable images of close objects is called its resolving power.

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

at the principal focus

at the centre of curvature

beyond the centre of curvature

between the pole of the mirror and the principal focus

NDA 2016 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

When three resistors, each having resistance r, are connected in parallel, their resultant resistance is x. If these three resistances are connected in series, then total resistance will be

3rx

$${3 \over x}$$

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Questions Asked from Marks 2.5