Physics Test 183

Result

Physics Test 183

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Question 1
4 / -1

A Carnot engine is working between 127^oC and 27^oC. The increase in efficiency will be maximum when the temperature of

A
the source is increased by 50^oC

B
the sink is decreased by 50^oC

C
source is increased by 25^oC and that of sink is decreased by 25^oC

D
both source and sink are decreased by 25^oC each.

Solution
Question 2
4 / -1

One litre of oxygen at a pressure of 1 atm, and 2 litres of nitrogen at a pressure of 0.5 atm are introduced in the vessel of 1 litre capacity, without any change in temperature. The total pressure would be

A
1.5 atm

B
0.5 atm

C
2.0 atm

D
1.0 atm

Solution
Question 3
4 / -1

A body executes simple harmonic motion under the action of a force F₁with a time period If the force is changed to F₂, it executes S.H.M. with time period . If both the forces F₁ and F₂act simultaneously in the same direction on the body, its time period in second is

A
12/25

B
7/5

C
24/25

D
5/7

Solution
Question 4
4 / -1

Each of the two strings of length 51.6 cm and 49.1 cm are tensioned separately by 20 N force. Mass per unit length of both the strings is same and equal to 1 g/m. When both the strings vibrate simultaneously the number of beats is

A
7

B
8

C
3

D
5

Solution
Question 5
4 / -1

Which of the following is a wrong statement?

A
The charge of an isolated system is conserved

B
It is not possible to create or destroy charged particles

C
It is possible to create or destroy charged particles

D
It is not possible to create or destroy net charge

Solution

It is possible to create or destroy charged particle but it is not possible to create or destroy net charge. The charge of an isolated system is conserved.
Question 6
4 / -1

In a given network the equivalent capacitance between A and B is

A

B

C

D

Solution
Question 7
4 / -1

A 6.0 volt battery is connected to two light bulbs as shown in figure. Light bulb 1 has resistance 3 ohm while light bulb 2 has resistance 6 ohm. Battery has negligible internal resistance. Which bulb will glow brighter?

A
Bulb 1 will glow more first and then its brightness will become less than bulb 2

B
Bulb 1

C
Bulb 2

D
Both glow equally

Solution
Question 8
4 / -1

The deflection in a galvanometer falls from 50 division to 20 when a 12 ohm shunt is applied. The galvanometer resistance is

A
18 ohm

B
36 ohm

C
24 ohm

D
30 ohm

Solution
Question 9
4 / -1

Two short bar magnets of length 1 cm each have magnetic moments 1.20 Am² and 1.00 Am² respectively. They are placed on a horizontal table parallel to each other with their N poles pointing towards the South. They have a common magnetic equator and are separated by a distance of 20.0 cm. The value of the result and horizontal magnetic induction at the mid-point O of the line joining their centres is close to (Horizontal component of earth’s magnetic induction is )

A

B

C

D

Solution
Question 10
4 / -1

A thin circular ring of area A is held perpendicular to a uniform magnetic field of induction B. A small cut is made in the ring and a galvanometer is connected across the ends such that the total resistance of the circuit is R. When the ring is suddenly squeezed to zero area, the charge flowing through the galvanometer is

A
BR/A

B
AB/R

C
ABR

D
B²A / R²

Solution