KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics: Questions 151 - 155 of 250

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Question number: 151

» Oscillations and Waves » Free Forced and Damped Oscillations

MCQ▾

Question

If an oscillator completes 200 oscillations, its amplitude decreases to 14 of its initial value. When it completes 400 oscillations, the amplitude will be –

Choices

Choice (4) Response
a.

16

b.

116

c.

18

d.

43

Question number: 152

» Thermodynamics » Laws of Thermodynamics » First Law of Thermodynamics

MCQ▾

Question

An ideal gas (γ=1.4) expands from 3×103m3 to 13×103m3 at a constant pressure of 2×105Pa . The heat energy supplied to the gas in this process is –

Choices

Choice (4) Response
a.

700J

b.

7000J

c.

70J

d.

7J

Question number: 153

» Oscillations and Waves » Wave Motion

Appeared in Year: 2015

MCQ▾

Question

The intensity of sound during the festival season increased by 100 times. This could imply a decibel level rise from,

Choices

Choice (4) Response
a.

20to120dB

b.

70to72dB

c.

100to10, 000dB

d.

80to100dB

Question number: 154

» Kinematics » Relative Velocity

MCQ▾

Question

A cart is moving along x direction with a velocity of 3 ms-1. A person on the cart throws a stone with a velocity of 8 ms-1 relative to himself. In the frame of reference of the cart the stone is thrown in yz plane making an angle of 600 with vertical y axis. The speed of stone at highest point of the trajectory the stone is –

Choices

Choice (4) Response
a.

2 ms-1

b.

5 ms-1

c.

4 ms-1

d.

2.5 ms-1

Question number: 155

» Ray Optics » Snell's Law

Appeared in Year: 2015

MCQ▾

Question

A cubical vessel has opaque walls. An observer (dark circle in figure below) is located such that she can see only the all CD but not the bottom. Nearly to what height should water be poured so that she can see an object placed at the bottom at a distance of 10 cm from the corner C? Refractive index of water is 1.33.

A cubic vessel has opaque wall

A Cubic Vessel Has Opaque Wall

In figure a cubic vessel is shown, which has opaque wall. And dark circle represent observer.

Choices

Choice (4) Response
a.

10 cm

b.

45 cm

c.

27 cm

d.

16 cm

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