NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 2136 - 2140 of 2184

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Question number: 2136

» Dual Nature of Matter and Radiation » Photoelectric Effect

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Appeared in Year: 2017

MCQ▾

Question

The photoelectric threshold wavelength of silver is The velocity of the electron ejected from a silver surface by ultraviolet light of wavelength is:

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 2137

» Thermodynamics » Carnot Engine and Its Efficiency

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Appeared in Year: 2017

MCQ▾

Question

A Carnot engine having an efficiency of as heat engine, is used as a refrigerator. If the work done on the system is , the amont of energy absorbed from the reservoir at lower temperature is:

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 2138

» Atoms and Nuclei » Hydrogen Spectrum

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Appeared in Year: 2017

MCQ▾

Question

The ratio of wavelengths of the last line of Balmer series and the last line of Lyman series is

Choices

Choice (4) Response

a.

0.5

b.

4

c.

1

d.

2

Question number: 2139

» Electronic Devices » Logic Gates (Or, and, NOT, NAND and Nor)

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Appeared in Year: 2017

MCQ▾

Question

The given electrical network is equivalent to

Electrical network

Electrical Network

In figure an electrical network consists of two OR gate and a NOT gate is shown.

Choices

Choice (4) Response

a.

NOR gate

b.

NOT gate

c.

OR gate

d.

AND gate

Question number: 2140

» Center of Mass » Centre of Mass of a Rigid Body

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Appeared in Year: 2017

MCQ▾

Question

Which of the following statements are correct?

  1. Center of mass of a body always coincides with the centre of gravity of the body.
  2. Center of mass of a body is the point at which the total gravitational torque on the body is zero
  3. A couple on a body produce both translational and rotational motion in a body.
  4. Mechanical advantage greater that one means that small effort can be used to lift a large load.

Choices

Choice (4) Response

a.

2 and 3

b.

2 and 4

c.

3 and 4

d.

1 and 2