CSIR (Council of Scientific & Industrial Research) Physical Sciences: Questions 133 - 135 of 463

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Question number: 133

» Classical Mechanics » Special Theory of Relativity » Relativistic Kinematics

Appeared in Year: 2011

MCQ▾

Question

A double pendulum consists of two point masses m attached by massless strings of length Equation as shown in the figure. The kinetic energy of the pendulum is –

 A double pendulum of two masses m

a Double Pendulum of Two Masses M

Figure shows a double pendulum consists of two point masses m attached by massless strings of length l.

(December)

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 134

» Electromagnetic Theory » Gauss Law and Applications

Appeared in Year: 2014

MCQ▾

Question

A solid of radius R has a charge density, given byEquation ; where Equation is the radial coordinate and Equation and R are positive constants. If the magnitude of the electric field at Equation is Equation times that at Equation then the value of a is – (December)

Choices

Choice (4) Response

a.

2

b.

Equation

c.

1

d.

Equation

Question number: 135

» Electronics and Experimental Methods » Opto-Electronic Devices » LEDs

Appeared in Year: 2012

MCQ▾

Question

An LED operates at 1.5 V and 5 mA in forward bias. Assuming an 80 % external efficiency of the LED, how many photons are emitted per second? (June)

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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