AIIMS (All India Institute of Medical Sciences) Physics: Questions 199 - 202 of 500

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Question number: 199

» Atoms and Nuclei » Half Life and Mean Life

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Appeared in Year: 2003

MCQ▾

Question

A radioactive substance decays to of its initial activity in 40 days. The half-life of the radioactive substance expressed in days is –

Choices

Choice (4)Response

a.

10

b.

5

c.

20

d.

2.5

Question number: 200

» Kinematics » Scalars and Vectors » Scalar and Vector Products

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Appeared in Year: 2009

Assertion-Reason▾

Question

Assertion (Ꭺ)

Assertion: Vector is perpendicular to

Reason (Ꭱ)

Two non-zero vectors are perpendicular if their dot product is equal to zero.

Choices

Choice (4)Response

a.

Ꭺ is false but Ꭱ is true

b.

Both Ꭺ and Ꭱ are false

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Ꭺ is true but Ꭱ is false

Question number: 201

» Magnetic Effects of Current and Magnetism » Earth's Magnetic Field

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Appeared in Year: 2005

Assertion-Reason▾

Question

Assertion (Ꭺ)

In high latitudes one sees colorful curtains of light hanging down from high altitudes.

Reason (Ꭱ)

The high energy charged particles from the sun are defected to Polar Regions by the magnetic field of the earth.

Choices

Choice (4)Response

a.

Ꭺ is false but Ꭱ is true

b.

Ꭺ is true but Ꭱ is false

c.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

d.

Both Ꭺ and Ꭱ are false

Question number: 202

» Dual Nature of Matter and Radiation » Photoelectric Effect

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Appeared in Year: 2006

Assertion-Reason▾

Question

Assertion (Ꭺ)

The photoelectrons produced by a monochromatic light beam incident on a metal surface have a spread in their kinetic energies.

Reason (Ꭱ)

The work function of the metal varies as a function of depth from the surface.

Choices

Choice (4)Response

a.

Ꭺ is false but Ꭱ is true

b.

Ꭺ is true but Ꭱ is false

c.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

d.

Both Ꭺ and Ꭱ are false

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