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AIIMS (All India Institute of Medical Sciences) Physics: Questions 197 - 201 of 500

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Question 197

Appeared in Year: 2005

Question MCQ▾

In semiconducting material the mobility of electrons and holes are and respectively. Which of the following is true?

Choices

Choice (4)Response

a.

b.

c.

d.

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Question 198

Appeared in Year: 2003

Question MCQ▾

A proton is about 1840 times heavier than an electron. When it is accelerated by a potential difference of 1 kV, its kinetic energy will be –

Choices

Choice (4)Response

a.

b.

1 KeV

c.

d.

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Question 199

Appeared in Year: 2003

Question MCQ▾

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

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Question 200

Appeared in Year: 2009

Question Assertion-Reason▾

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

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Question 201

Appeared in Year: 2005

Question Assertion-Reason▾

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

Edit