KVPY (Kishore Vaigyanik Protsahan Yojana) Stream-SA (Class 11) Physics: Questions 19 - 22 of 253

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Question number: 19

» Oscillations and Waves » Periodic Motion - Period Frequency

Appeared in Year: 2010

MCQ▾

Question

A hollow pendulum bob filled with water has a small hole at the bottom through which water escapes at a constant rate. Which of the following statements describes the variation of the time period (T) of the pendulum as the water flows out?

Choices

Choice (4) Response

a.

T decreases first and then increases

b.

T does not change

c.

T increases throughout

d.

T increases first and then decreases

Question number: 20

» Kinematics » Relative Velocity

Appeared in Year: 2011

MCQ▾

Question

A girl standing at point P on a beach wishes to reach a point Q in the sea as quickly as possible. She can run at 6 km h –1 on the beach and swim at 4 km h –1 in the sea. She should take the path,

Four different paths from P to Q

Four Different Paths From P to Q

Figure shows four different paths for reaching P to Q.

Choices

Choice (4) Response

a.

PCQ

b.

PDQ

c.

PAQ

d.

PBQ

Question number: 21

» Ray Optics » Reflection and Refraction of Light

Appeared in Year: 2010

Short Answer Question▾

Write in Short

A point source is placed 20 cm to the left of a concave lens of focal length 10 cm.

(a) Where is the image formed?

(b) Where to the right of the lens would you place a concave mirror of focal length 5 cm such that the final image is coincident with the source?

Question number: 22

» Current Electricity » Electrical Resistance

Short Answer Question▾

Write in Short

Consider the two circuits P and Q, shown below, which are used 20 measure the unknown resistance R.

Circuit diagrams P and Q

Circuit Diagrams P and Q

In figure two circuit diagrams P and Q are shown. In circuit P voltmeter is use to measuring voltage across only R, and in circuit Q voltmeter use for measuring voltage across R and Ammeter.

In each case, the resistance is estimated by using Ohm’s law , Where V and I are the readings of the voltmeters and the ammeters respectively. The internal resistances of voltmeter and ammeter are R V and R A, such that R A < < R < < R V.

The internal resistance of the battery may be ignored. The absolute error in the estimate of the resistance is denoted by δ R =| R - Rest| .

(a) Express δ R P in terms of the given resistance values

(b) Express δ R Q in terms of the given resistance values

(c) For what value of R will δ R P ≈ δ R Q

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