KVPY (Kishore Vaigyanik Protsahan Yojana) Stream-SA (Class 11) Physics: Questions 236 - 240 of 253

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Question number: 236

» Work, Energy and Power » Potential Energy

MCQ▾

Question

In a molecule, the potential energy between two atoms is given as: Equation , where a and b are positive constant and x is the distance between atoms. For stable equilibrium of atom, the value of x is –

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Zero

Question number: 237

» Current Electricity » Electrical Energy and Power

MCQ▾

Question

If the current through a resistor in a circuit increases by 3.5%, the power dissipated by the resistor –

Choices

Choice (4) Response

a.

Decreases approximately by 7%

b.

Increases approximately by 7%

c.

Increases approximately by 24.5%

d.

Increases approximately by 3.5%

Question number: 238

» Center of Mass » Centre of Mass of a Rigid Body

MCQ▾

Question

A block moves in a parabolic path explodes during its flight. The center of the mass of the block will move,

Choices

Choice (4) Response

a.

In horizontal direction

b.

Along the tangent to the original parabolic path.

c.

Along the same parabolic path in which the original shell was moving

d.

Vertically downward

Question number: 239

» Laws of Motion » Laws of Friction

MCQ▾

Question

A body moving on a rough horizontal surface comes to a stop in a distance 10 m. If the initial kinetic energy is 20 J, the force of the friction exerted on the body is –

Choices

Choice (4) Response

a.

3 N

b.

5 N

c.

2 N

d.

4 N

Question number: 240

» Work, Energy and Power » Potential Energy

MCQ▾

Question

Potential energy of a spring when stretched by 5 cm is U. When stretched by 15 cm, its potential energy will be,

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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