KVPY (Kishore Vaigyanik Protsahan Yojana) Stream-SA (Class 11) Physics: Questions 39 - 42 of 253

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Question number: 39

» Work, Energy and Power » Kinetic Energy

Appeared in Year: 2012

MCQ▾

Question

A clay ball of mass m and speed v strikes another metal ball of same mass m, which is at rest. They stick together after collision. The kinetic energy of the system after collision is:

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 40

» Atoms and Nuclei » Radioactive Decay Law

MCQ▾

Question

Equation atom disintegrates to Equation by emitting 5 alpha particle and n electrons. Here n is:

Choices

Choice (4) Response

a.

6

b.

7

c.

3

d.

10

Question number: 41

» Laws of Motion » Laws of Friction

Appeared in Year: 2012

MCQ▾

Question

A girl holds a book of mass m against a vertical wall with a horizontal force F using her finger so that the book does not move. The frictional force on the book by the wall is:

Choices

Choice (4) Response

a.

Equal and opposite to the resultant of F and mg

b.

μF upwards where μ is the coefficient of static friction

c.

mg and upwards

d.

F and along the finger but pointing towards the girl

Question number: 42

» Kinematics » Velocity-Time Graphs

Appeared in Year: 2013

MCQ▾

Question

A ball is thrown horizontally from a height with a certain initial velocity at time t = 0. The ball bounces repeatedly from the ground with the coefficient of restitution less than 1 as shown.

A ball is thrown horizontally

A Ball Is Thrown Horizontally

In figure a ball is thrown horizontally from a height with a certain initial velocity at time t = 0 is shown.

Neglect air resistance and taking the upward direction as positive, which figure qualitatively depicts the vertical component of the balls velocity (VY) as a function of time (t)?

Choices

Choice (4) Response

a.

Graph of component of velocity Vy ⟶ time t (choice A)

Graph of Component of Velocity Vy ⟶ Time T (Choice A)

Figure represent plot of component of velocity of ball (Vy) ⟶ time (t)

b.

Graph of component of velocity Vy ⟶ time t (choice B)

Graph of Component of Velocity Vy ⟶ Time T (Choice B)

Figure represent plot of component of velocity of ball (Vy) ⟶ time (t)

c.

Graph of component of velocity Vy ⟶ time t (choice C)

Graph of Component of Velocity Vy ⟶ Time T (Choice C)

Figure represent plot of component of velocity of ball (Vy) ⟶ time (t)

d.

Graph of component of velocity Vy ⟶ time t (choice D)

Graph of Component of Velocity Vy ⟶ Time T (Choice D)

Figure represent plot of component of velocity of ball (Vy) ⟶ time (t)

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