Physics Test 76

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Physics Test 76

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Weekly Quiz Competition

Question 1
4 / -1

The capacitance of the capacitors of plate area A₁ and A₂ (A₁ < A₂) at a distance 'd' is :

A

B

C

D

Solution

Overlapping area is considered in the equation of parallel plate capacitor.
Question 2
4 / -1

The charge on 1µF capacitor and the total charge flown through battery is respectively :

A
4µC, 54µC

B
24µC, 54µC

C
4µC, 30µC

D
24µC, 30µC

Solution

q_4µF ⇒ 24 µC
q_6µF ⇒ 6 × 4 ⇒ 24 µC
q_1µF ⇒ 4 × 1 ⇒ 4 µC
q_5µF ⇒ 4 × 5 ⇒ 20 µC
q_3µF ⇒ 3 × 10 ⇒ 30 µC
∴ q_F ⇒ 30 + 24 ⇒ 54 µC
Question 3
4 / -1

Two identical capacitors 1 and 2 are connected in series to a battery as shown in figure. Capacitor 2 contains dielectric of constant K. Q₁ and Q₂ are charges stored on both capacitors. Now the dielectric slab is removed and the corresponding charges are Q₁' and Q₂'. Then :

A

B

C

D

Solution
Question 4
4 / -1

A capacitor stores 60µC charge when connected across a battery. When the gap between the plates is filled with a dielectric, a charge of 120µC flows through the battery. The dielectric constant of the material inserted is :

A
1

B
2

C
3

D
None

Solution

q_initial ⇒ C_initial V ....(1)
q_final ⇒ C_final V ....(2)
Question 5
4 / -1

Which of the following statements is correct for the given circuit:

A
V₁ = 15 V, V₂ = 20 V when only S₁ is closed.

B
V₁ = V₂ = 25V when only S₃ is closed.

C
V₁ = V₂ = 0 when only S₁ and S₂ are closed together

D
V₁ = 30, V₂ = 20 V when only S₁ and S₃ are closed together.

Solution

Redistribution of charge in ckt will occur only when circuit is complete. Hence voltage will remain unchanged unless all the three switches are closed.
Question 6
4 / -1

Block is attached at one end of string and other end is pulling with constant speed then :

A
Speed of block remain constant

B
Acceleration of block remain constant

C
Speed of block will increase

D
Speed of block will decrease

Solution
Question 7
4 / -1

A system consists of three masses m₁, m₂ and m₃ connected by a string passing over a pulley P. The mass m₁ hangs freely m₂ and m₃ are on a rough horizontal table (the coefficient of friction = µ). The pulley is frictionless and is of negligible mass. The downward acceleration of mass m₁ is :

A

B

C

D

Solution
Question 8
4 / -1

All surfaces are smooth then a_A and a_B :

A
a_A = a_B = 1 m/s²

B
a_A = 3m/s² ; a_B = 0

C

D

Solution
Question 9
4 / -1

Two blocks are in contact on a frictionless table. One has mass 'm' and the other '2m'. Same force F is applied from left and right on m and 2m. In the two cases respectively, the ratio of contact force between the blocks in the two cases will be

A
1 : 4

B
2 : 1

C
1 : 1

D
2 : 3

Solution
Question 10
4 / -1

Every surface is smooth, system is released from rest then :

A
A, B, C will always remain in rest

B
Acceleration of B will be along negative x and negative y

C
Acceleration of C will be only along negative y

D
Acceleration of C will be along negative y and positive x

Solution