NDA 2015 Paper 2 | Physics Question 22 | General Science

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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?

Wm^$$-$$1K^$$-$$1

Wm/K

Wm^$$-$$1/K^$$-$$1

Js^$$-$$1m^$$-$$1K

NDA 2015 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

Which one of the following statements is not correct?

Conduction can occur easily in solids, less easily in liquids but hardly at all in gases.

Heat energy is carried by moving particles in a convection current.

Heat energy is carried by electromagnetic waves in radiation.

The temperature at which a solid changes into a liquid is called the boiling point.

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.

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Questions Asked from Marks 2.5