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Posted: July 29, 2013 in Questions of class-11

IOE 9807724256

Posted: July 26, 2013 in IOE INTRANCE

Q.1

A Carnot engine working between 300 K and 600 K has a work output of 800 J per cycle. The amount of heat energy supplied to the engine from the source in each cycle is

800 J

1600 J

3200 J

6400 J
Q.2

The temperature of the sink of a Carnot engine is 27o C. If the efficiency of the engine is 25 %, the temperature of the source is

227o C

327o C

127o C

27o C
Q.3

A refrigerator with its power on, is kept in a closed room with its door open, the temperature of the room

Rise

Fall

Remains the same

Depends on area of the room

Q.4

A gas expends 0.25 m3 constant pressure 10 m3 N/m2 , the work done is

2.5 x 10-7 J

250 J

250 W

250 N
Q.5

If the system undergoes contraction of volume, then the workdone by the system is

Positive

Negative

Negligible

Zero
Q.6

Water is boiling in a flask over a burner. To reduce its boiling temperature one must

Reduce the surrounding temperature

Connect the mouth of the flask to an evacuating system

Supply heat from a very intense heat source

Close the container with an airtight cork

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Posted: July 26, 2013 in IOE INTRANCE

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Q.1

The period of revolution of planet A around the sun is 8 times that of B. The distance of A from the sun is how many times greater than that of B from the sun?

2

3

4

5
Q.2

The orbital velocity of an artifical satellite in a circular orbit just above the earth surface is v. For a satellite orbiting at an altitude of half of the earth’s radius, the orbital velocity is

3v / 2

v√(3/2)

v√(2/3)

2/3 v
Q.3

If ve and v0 represent the escape velocity and orbital velocity of a satellite corresponding to a circular orbit of radius R, than

ve a= v0

ve = √2 v0

ve = v0 / √2

ve and v0 are not related
Q.4

The time period of a satellite in a circular orbit of radius R is T, the period of another satellite in a circular orbit of radius 4 R is

4 T

T / 4

8T

T / 8
Q.5

Two plants of radii R1 and R2 are made from the same material. The ratio of the acceleration of gravity g1 / g2 at the surfaces of the two planets is

R1 / R2

R2 / R1

(R1 / R2 )2

(R2 / R1 )2

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