KVPY (Kishore Vaigyanik Protsahan Yojana) Stream-SA (Class 11) Physics: Questions 99 - 101 of 253

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Question number: 99

» Laws of Motion » Law of Conservation of Linear Momentum

MCQ▾

Question

Two balls m1 and m2 are moving in the straight line, approaching each other as shown. After collision these objects stick together. What will be the velocity (in m/s) of the combined object after collision?

 System consist of two balls

System Consist of Two Balls

In figure two balls approaching to each other. Mass m1 and m2 of the balls are 15 and 25 respectively. Velocity V1 and V2 of the balls are 20 m/s and 5 m/s respectively.

Choices

Choice (4) Response

a.

3.75

b.

5.454

c.

6.523

d.

4.375

Question number: 100

» Ray Optics » Resolving Power of Microscopes and Astronomical Telescopes

MCQ▾

Question

The eye is natural optical instrument. Because,

(1) It can adjust aperture

(2) It can focusing according to distance by changing focal length of lens

(3) It can adjust intensity of light

(4) Focal length remains fix

Select the correct option,

Choices

Choice (4) Response

a.

(1) and (2) correct

b.

(2) and (3) correct

c.

(1) and (4) correct

d.

(1), (2) & (3) are correct

Question number: 101

» Thermodynamics » Thermal Equilibrium

Appeared in Year: 2014

MCQ▾

Question

An aluminum piece of mass 50 g initially at 300 °C is dipped quickly and taken out of 1 kg of water, initially at 30° C. if the temperature of the aluminum piece immediately after being taken out of the water is found to be 160°C, what is the temperature of the water then? (Specific heat capacities of aluminum and water are 900 J kg–1 K–1 and 4200 J kg–1, respectively. )

Choices

Choice (4) Response

a.

31.5°C

b.

45°C

c.

28.5°C

d.

165°C

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