KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics: Questions 190 - 193 of 268

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Question number: 190

» Work, Energy and Power » Work Done

MCQ▾

Question

A block of mass 25 kg slides down a rough slope which is inclined at 450 to the horizontal. The coefficient of sliding friction is 0.30. When the block has slid 15 m, the work done on the block by the force of friction is nearly,

Choices

Choice (4) Response

a.

397.7J

b.

397.7J

c.

795.45 J

d.

795.45J

Question number: 191

» Thermodynamics » Measurement of Temperature

MCQ▾

Question

A 10 kW drilling machine is used to drill a hole in a metal block of mass 15 kg. Assuming that 30 % power is lost in the machine, calculate the rise in temperature of the block in 4 minutes. Specific heat capacity of metal = 0.4 Jg-1 K-1.

Choices

Choice (4) Response

a.

2500C

b.

3000C

c.

3200C

d.

2800C

Question number: 192

» Thermodynamics » Thermodynamic Processes

Appeared in Year: 2015

MCQ▾

Question

The state of an ideal gas was changed isobarically. The graph depicts three such isobaric lines. Which of the following is true about the pressures of the gas?

Graph of isobaric processes

Graph of Isobaric Processes

The state of an ideal gas was changed isobarically. In figure graph depicts three such isobaric lines.

Choices

Choice (4) Response

a.

P1P2=P3P1

b.

P1>P2>P3

c.

P1=P2=P3

d.

P1<P2<P3

Question number: 193

» Current Electricity » Electric Current

Appeared in Year: 2015

MCQ▾

Question

In the circuit shown below, all the inductors (assumed ideal) and resistors are identical. The current through the resistance on the right is I after the key K has been switched on for a long time. The currents through the three resistors (in order, from left to right) immediately after the key is switched off are,

Circuit diagram of combination of resistors and inductors

Circuit Diagram of Combination of Resistors and Inductors

In figure a circuit diagram of combination of three resistors and two inductors is shown.

Choices

Choice (4) Response

a.

2I upwards, I downwards and I downwards.

b.

I downward, I downward and I downwards.

c.

0, I downwards and I downwards

d.

2I downward, I downward and I downwards.

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