KVPY Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 26 - 28 of 268

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Question number: 26

» Oscillations and Waves » Periodic Motion - Period Frequency

Appeared in Year: 2010

MCQ▾

Question

A bead of mass m is attached to the mid-point of a taut, weightless string of length l and placed on a frictionless horizontal table.

 A bead of mass m is attached to the mid-point of a taut

a Bead of Mass M Is Attached to the Mid-Point of a Taut

In figure a bead of mass m is attached to the mid-point of a taut, weightless string of length l and placed on a frictionless horizontal table.

Under a small transverse displacement x, as shown, if the tension in the string is T, then the frequency of oscillation is –

Choices

Choice (4) Response

a.

12π2Tml

b.

12π2Tm

c.

12π4Tm

d.

12π4Tml

Question number: 27

» Electromagnetic Waves » Electromagnetic Waves & Characteristics

Appeared in Year: 2010

MCQ▾

Question

The following travelling electromagnetic wave

Ex=0 , Ey=E0sin(kx+ωt) , Ez=2E0sin(kxωt) is-

Choices

Choice (4) Response

a.

Circularly polarized

b.

Unpolarized

c.

Linearly polarized

d.

Elliptically polarized

Question number: 28

» Thermodynamics » Laws of Thermodynamics » Second Law of Thermodynamics

Appeared in Year: 2010

MCQ▾

Question

A piece of hot copper at 1000C is plunged into a pond at 300C. The copper cools down to 300C, while the pond, being huge, stays at its initial temperature. Then-

Choices

Choice (4) Response

a.

Copper loses some entropy; the pond stays at the same entropy

b.

Copper loses some entropy, and the pond gains exactly the same amount of entropy

c.

Copper loses entropy and the pond gains more than this amount of entropy

d.

copper and the pond gain in entropy

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