AIIMS Physics: Questions 81 - 85 of 500

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Question number: 81

» Ray Optics » Total Internal Reflection

Appeared in Year: 2005

MCQ▾

Question

What should be the maximum acceptance angle at the air-core interface of an optical fiber if n1 and n2 are the refractive indices of the core and the cladding, respectively – [AIIMS]

Choices

Choice (4) Response

a.

sin1n12n22

b.

[tan1n2n1]

c.

sin1(n2n1)

d.

[tan1n1n2]

Question number: 82

» Kinematics » Projectile Motion

Appeared in Year: 2000

MCQ▾

Question

A body is projected at such an angle that the horizontal range is three times the greatest height. The angle of projection is [DPMT]

Choices

Choice (4) Response

a.

42°

b.

53°

c.

25°

d.

33°

Question number: 83

» Physics and Measurement » Dimensions of Physical Quantities

Appeared in Year: 2005

MCQ▾

Question

The dimensional formula of angular velocity is [JIPMER 1993; AFMC 1996]

Choices

Choice (4) Response

a.

ML0T2

b.

M0L0T1

c.

MLT1

d.

M0L0T1

Question number: 84

» Magnetic Effects of Current and Magnetism » Bar Magnet

Appeared in Year: 1995

MCQ▾

Question

Force between two identical bar magnets whose centers are r meter apart is 4.8 N when their axes are in same line. If separation is increased to 2r, the force between them is reduced to: [AIIMS]

Choices

Choice (4) Response

a.

0.6 N

b.

0.3 N

c.

1.2 N

d.

2.4 N

Question number: 85

» Kinematics » Scalars and Vectors » Scalar and Vector Products

MCQ▾

Question

What happens, when we multiply a vector by (- 2)?

Choices

Choice (4) Response

a.

Direction reverses and unit changes

b.

Direction remains unchanged and unit changes

c.

Direction reverses and magnitude is doubled

d.

Question does not provide sufficient data or is vague

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