KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 109 - 112 of 268

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Question number: 109

» Atoms and Nuclei » Half Life and Mean Life

Appeared in Year: 2013

MCQ▾

Question

Two species of radioactive atoms are mixed in equal number. The disintegration of the first species is λ and of the second isEquation . After a long time the mixture will behave as a species with mean life of approximately,

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 110

» Current Electricity » Series and Parallel Combinations of Resistors

Appeared in Year: 2013

MCQ▾

Question

Consider the circuit shown in the figure below:

Reduced circuit of given circuit

Reduced Circuit of Given Circuit

Figure shows the reduced circuit of given circuit.

All the resistors are identical. The charge stored in the capacitor, once it is fully charged, is

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

0

d.

Equation

Question number: 111

» Ray Optics » Mirror Formula

Appeared in Year: 2014

MCQ▾

Question

The flat face of a Plano-convex lens of focal length 10 cm is silvered. A point source placed 30 cm in front of the curved surface will produce a

Choices

Choice (4) Response

a.

Real image 6 cm away from the lens

b.

Real image 15 cm away from the lens

c.

virtual image 15 cm away from the lens

d.

virtual image 6 cm away from the lens

Question number: 112

» Magnetic Effects of Current and Magnetism » Electric Charge Moving in Magnetic Field

Appeared in Year: 2013

MCQ▾

Question

An electron enters a chamber in which a uniform magnetic field is present as shown. Ignore gravity,

An electron enters in a chamber

An Electron Enters in a Chamber

Figure shows that an electron enters a chamber in which a uniform magnetic field is present.

During its motion inside the chamber

Choices

Choice (4) Response

a.

The speed of the electron increases at a uniform rate

b.

The force on the electron remains constant

c.

The kinetic energy of the electron remains constant

d.

The momentum of the electron remains constant

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