KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics: Questions 50 - 52 of 250

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Question number: 50

» Laws of Motion » Equilibrium of Concurrent Forces

Appeared in Year: 2012

MCQ▾

Question

A particle is acted upon by a force given by F=αx3βx4 where α and β are positive constants. At the point x = 0, the particle is –

Choices

Choice (4) Response
a.

In unstable equilibrium

b.

In stable equilibrium

c.

In neutral equilibrium

d. None of the above

Question number: 51

» Rotational Motion » Moment of Inertia

Appeared in Year: 2012

MCQ▾

Question

Seven identical coins are rigidly arranged on a flat table in the pattern shown below so that each coin touches its neighbors. Each coin is a thin disc of mass m and radius r. Note that the moment of inertia of an individual coin about an axis passing through center and perpendicular to the plane of the coin is mr22 .

Arrangement of seven identical coins

Arrangement of Seven Identical Coins

In figure seven identical coins are rigidly arranged on a flat table in the pattern such that each coin touches its neighbors.

The moment of inertia of the system of seven coins about an axis that passes through the point P (the centre of the coin positioned directly to the right of the central coin) and perpendicular to the plane of the coins is-

Choices

Choice (4) Response
a.

1272mr2

b.

55mr2

c.

1112mr2

d.

552mr2

Question number: 52

» Electromagnetic Induction & Alternating Currents » Induced EMF and Current

Appeared in Year: 2011

MCQ▾

Question

In the circuit shown, the switch is closed at time t = 0.

Diagram of R-L circuit at time t = 0

Diagram of R-L Circuit at Time T = 0

In figure a resistance, inductor, a switch and a battery of 10 V is connected in a circuit.

Which of the graphs shown below best represents the voltage across the inductor, as seen on an oscilloscope?

Choices

Choice (4) Response
a.
Graph of voltage verses time choice – A

Graph of Voltage Verses Time Choice – A

In figure graph represents the voltage across the inductor, as seen on an oscilloscope?

b.
Graph of voltage verses time choice – B

Graph of Voltage Verses Time Choice – B

In figure graph represents the voltage across the inductor, as seen on an oscilloscope?

c.
Graph of voltage verses time choice – C

Graph of Voltage Verses Time Choice – C

In figure graph represents the voltage across the inductor, as seen on an oscilloscope?

d.
Graph of voltage verses time choice – D

Graph of Voltage Verses Time Choice – D

In figure graph represents the voltage across the inductor, as seen on an oscilloscope?

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