NDA 2018 Paper 2 | Physics Question 144 | General Science

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NDA 2018 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

Which one of the following statement is correct for a plane mirror?

its focal length is zero.

The size of the image of an object placed in front of the mirror is slightly less than that of the object.

The image is virtual, erect and laterally inverted.

Its focal length is 200 cm.

NDA 2018 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

An object is placed in front of a convex mirror. Which one of the following statement is correct?

It will never form an inverted image.

The image moves towards the focus when the object moves towards the mirror.

Depending on the position of the object with respect to the mirror, the image can be inverted and real.

The size of the image becomes larger than that of the object when the object is placed at a distance equal to half the focal length.

NDA 2018 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

A circular coil of radius R having N number of turns carries a steady current I. The magnetic induction at the centre of the coil is 0.1 T. If the number of turns is doubled and the radius is halved, then which one of the following will be the correct value for the magnetic induction at the centre of the coil?

0.05 T

0.2 T

0.4 T

0.8 T

NDA 2018 Paper 1

MCQ (Single Correct Answer)

+2.5

-0.83

Which one of the following statement is correct?

Any energy transfer that does not involve temperature difference in some way is not heat.

Any energy transfer always requires a temperature difference.

On heating, the length and volume of the object remain exactly the same.