Kinetic energy before collision is always equal to the kinetic energy after collision.

How does a host on an Ethernet LAN know when to transmit after a collision has occurred?
1. In a CSMA/CD collision domain, multiple stations can successfully transmit data simultaneously.
2. In a CSMA/CD collision domain, stations must wait until the media is not in use before transmitting.
3. You can improve the CSMA/CD network by adding more hubs.
4. After a collision, the station that detected the collision has first priority to resend the lost data.
5. After a collision, all stations run a random backoff algorithm. When the backoff delay period has expired, all stations have equal priority to transmit data.

A

1 and 3

B

2 and 4

C

1,3 and 4

D

2 and 5

Consider the following sentences.
1. In an inelastic collision, only momentum is conserved.
2. In elastic collision, both momentum and kinetic energy are conserved.
3. In an inelastic collision, both momentum and kinetic energy are conserved
Which of the sentences given above are correct?

A

1 and 2

B

2 and 3

C

1 and 3

D

1 and 3

Consider the following statements: 1. The kinetic friction is always less than the rolling friction. 2. The kinetic friction is always equal to the rolling friction. 3. The kinetic friction is always greater than the rolling friction. Which of the following statement is correct?

A

Both 1 and 2

B

Both 2 and 3

C

Only 3

D

All 1,2 and 3

What is the result of segmenting a network with a bridge (switch)?
1. It increases the number of collision domains.
2. It decreases the number of collision domains.
3. It increases the number of broadcast domains.
4. It decreases the number of broadcast domains.
5. It makes smaller collision domains.
6. It makes larger collision domains.

A

1 and 5

B

2, 3 and 5

C

3, 4 and 6

D

1, 3 and 6

In an inelastic collision, the final kinetic energy is always less than the initial kinetic energy of the system.

A

True

B

False

Assertion: In and elastic collision of two billiard balls, the total kinetic energy is conserved during the short time of collision of balls. Reason: Energy spent against friction does not follow the law of conservation of energy

A

Both assertion and reason are true and the reason is the correct explanation of the assertion

B

Both assertion and reason are true but the reason is not the correct explanation of the assertion

C

Both assertion and reason are false

D

Assertion is true but the reason is false

Match the following Device Conversion of Energy (a) Windmill (i) Chemical Energy to electrical energy (b) Bulb (ii) Kinetic Energy to Electrical Energy (c) Electrical Cell (iii) Sound Energy to Electrical energy (d) Microphone (iv) Electrical Energy to Light Energy

A

(a) - (iii), (b) - (ii), (c) - (i), (d) - (iv)

B

(a) - (ii), (b) - (iv), (c) - (i), (d) - (iii)

C

(a) - (ii), (b) - (iii), (c) - (i), (d) - (iv)

D

(a) - (iii), (b) - (ii), (c) - (iv), (d) - (i)

A sphere of mass 25 Kg is moving at a speed of 1.5 m/s undergoes collision with another sphere of mass 50 Kg moving at 3m/s in the same direction, find the common velocity in m/s after collision when the collision is completely inelastic.

A

2.5

B

9.75

C

7.25

D

6.75

A sphere of mass 25 Kg is moving at a speed of 1.5 m/s undergoes collision with another sphere of mass 50 Kg moving at 3m/s in the same direction, find the velocity of 50 Kg mass in m/s after collision when the collision is elastic.

A

2.5

B

2.00

C

7.25

D

6.75

A sphere of mass 25 Kg is moving at a speed of 1.5 m/s undergoes collision with another sphere of mass 50 Kg moving at 3m/s in the same direction, find the velocity of 25 Kg mass in m/s after collision when the collision is elastic.

A

2.5

B

2.00

C

3.5

D

6.75

Kinetic energy before collision is always equal to the kinetic energy after collision.

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