NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 2135 - 2139 of 2142

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Question number: 2135

» Dual Nature of Matter and Radiation » Photoelectric Effect

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: 2136

» Thermodynamics » Carnot Engine and Its Efficiency

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: 2137

» Atoms and Nuclei » Hydrogen Spectrum

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.

1

b.

0.5

c.

2

d.

4

Question number: 2138

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

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.

AND gate

b.

NOT gate

c.

NOR gate

d.

OR gate

Question number: 2139

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

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

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