KVPY Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 174 - 177 of 268

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Question number: 174

» Properties of Solids & Liquids » Stress-Strain Relationship

MCQ▾

Question

A metal wire of cross-sectional area Equation is held taut at 500 C between two rigid supports with negligible tension in it. The tension developed in the wire if it cooled to -100 C is –

(Given α of metal Equation and Equation )

Choices

Choice (4) Response

a.

1440 N

b.

1200 N

c.

1080N

d.

563 N

Question number: 175

» Magnetic Effects of Current and Magnetism » Para, Dia and Ferro-Magnetic Substances

Appeared in Year: 2015

MCQ▾

Question

Consider the regular array of vertical identical current carrying wires (with direction of current flow as indicated in the figure below) producing through a horizontal table. If we scatter some diamagnetic particles on the table, they are likely to accumulate.

Regular array of vertical identical current carrying wires

Regular Array of Vertical Identical Current Carrying Wires

In figure a regular array of vertical identical current carrying wires producing through a horizontal table is shown. The direction of current flow as indicated in the figure.

Choices

Choice (4) Response

a.

Around regions such as B

b.

In circular regions around individual wires such as C

c.

Uniformly everywhere.

d.

Around regions such as A

Question number: 176

» Thermodynamics » Carnot Engine and Its Efficiency

MCQ▾

Question

A Carnot engine has efficiency 30 % (heat sink 270 C). To increase efficiency by 20%, the temperature be increased by,

Choices

Choice (4) Response

a.

40.15 K

b.

15.7 K

c.

20.25 K

d.

55.7 K

Question number: 177

» Laws of Motion » Centripetal Force

MCQ▾

Question

A gramophone disc makes 75 rpm. A coin of mass 60 gm is placed at a distance of 20 cm from the center. What is the centrifugal force acting on the coin?

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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