Physics Test 175

Result

Physics Test 175

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Weekly Quiz Competition

Question 1
4 / -1

Calculate the work done when 1 mole of a perfect gas is compressed adiabatically. The initial pressure and volume of the gas are and 6 L respectively. The final volume of the gas is 2 L. Molar specific heat of the gas at constant volume is 3R/2. [Given 6.19]

A
–957 J

B
+957 J

C
– 805 J

D
+ 805 J

Solution
Question 2
4 / -1

Three perfect gases at absolute temperatures are mixed. The masses of molecules are m₁, m₂ and m₃ and the number of molecules are respectively. Assuming no loss of energy, the final temperature of the mixture is

A

B

C

D

Solution
Question 3
4 / -1

A coin is placed on a horizontal platform which undergoes vertical simple harmonic motion of angular frequency ω. The amplitude of oscillation is gradually increased. The coin will leave contact with the platform for the first time

A

B

C

D

Solution
Question 4
4 / -1

A

B

C

D

Solution
Question 5
4 / -1

Two small similar metal spheres A and B having charges 4q and – 4q, when placed at a certain distance apart, exert an electric force F on each other. When another identical uncharged sphere C, first touched with A then with B and then removed to infinity, the force of interaction between A and B for the same separation will be

A
F/2

B
F/8

C
F/16

D
F/32

Solution
Question 6
4 / -1

A capacitor of 2F is charged as shown in the diagram.

When the switch S is turned to position 2, the percentage of its stored energy dissipated is

A
0%

B
20%

C
75%

D
80%

Solution

When S and 1 are connected

The 2µF capacitor gets charged. The potential difference across its plates will be V.

The potential energy stored in 2 µF capacitor

When S and 2 are connected

The 8µF capacitor also gets charged. During this charging process current flows in the wire and some amount of energy is dissipated as heat. The energy loss is
Question 7
4 / -1

If current flowing in a conductor changes by 1% then power consumed will change by

A
10%

B
2%

C
1%

D
100%

Solution
Question 8
4 / -1

A particle of charge q and mass m moves in a circular orbit of radius r with angular speed w . The ratio of the magnitude of its magnetic moment to that of its angular momentum depends on

A
ω and q

B
ω, q and m

C
q and m

D
ω and m

Solution

Thus the required ratio depends upon both q and m.
Question 9
4 / -1

Two short bar magnets P and Q are arranged such that their centres are on the X-axis and are separated by a large distance. The magnetic axes of P and Q are along X and Y axes respectively. At a point R, midway between their centres, if B is the magnitude of induction due to Q, the magnitude of total induction at R due to the both magnets is

A
3B

B
√5B

C
(√5)/2 B

D
B

Solution
Question 10
4 / -1

The magnetic flux through a circuit of resistance R changes by an amount in a time t. Then the total quantity of electric charge Q that passes any point in the circuit during the time t is represented by

A

B

C

D

Solution