KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics: Questions 186 - 189 of 250

Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 250 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. View Sample Explanation or View Features.

Rs. 200.00 or

Question number: 186

» Dual Nature of Matter and Radiation » Photoelectric Effect

Appeared in Year: 2015

MCQ▾

Question

A 160 watt infrared source is radiating light of wavelength 50000 Å uniformly in all directions. The photon flux at a distance of 1.8m is of the order of,

Choices

Choice (4) Response

a.

1020m2s1

b.

10m2s1

c.

1015m2s1

d.

1010m2s1

Question number: 187

» Oscillations and Waves » Periodic Functions

Appeared in Year: 2013

MCQ▾

Question

A ball is rolling without slipping in a spherical shallow bowl (radius R) as shown in the figure and is executing simple harmonic motion. If the radius of the ball is doubled, the period of oscillation,

 A ball is rolling without slipping in a spherical shallow bowl

a Ball Is Rolling Without Slipping in a Spherical Shallow Bowl

In figure a ball is rolling without slipping in a spherical shallow bowl is shown.

Choices

Choice (4) Response

a.

Decreases slightly

b.

Is increased by a factor of 2

c.

Increases slightly

d.

Is reduced by a factor of 12

Question number: 188

» Work, Energy and Power » Conservative and Non-Conservative Forces

Appeared in Year: 2014

MCQ▾

Question

A 1.5 kW (kilo-watt) laser beam of wavelength 6400 Å is used to levitate a thin aluminum disc of same area as the cross-section of the beam. The laser light is reflected by the aluminum disc without any absorption. The mass of the foil is close to

Choices

Choice (4) Response

a.

104kg

b.

106kg

c.

103kg

d.

109kg

Question number: 189

» Work, Energy and Power » Work-Energy Theorem

MCQ▾

Question

A moving particle of mass m makes a head – on – collision with a particle of mass 3 m initially at rest. If the collision is perfectly elastic, the percentage loss of energy of the colliding particle is –

Choices

Choice (4) Response

a.

50 %

b.

60 %

c.

75 %

d.

100 %

Sign In