Physics Test 115

Result

Physics Test 115

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
4 / -1

A 1 kg block is being pushed against a wall by a force F = 75 N as shown in the Figure. The coefficient of friction is 0.8. The magnitude of acceleration of the block is:

A
10 m/s²

B
0 m/s²

C
5 m/s²

D
None of these

Solution

N_R = 60 N

(Fs)_max = 48 N

35 N < 48 N

so block will remain stationary
Question 2
4 / -1

In the figure shown, find the accelerations of blocks A, B and C immediately after string connecting between block B and block C is cut.

A
a_A = 3g↓, a_B = g↓, a_C = g↓

B
a_A = 2g↓, a_B = a_C = 0

C
a_A = 3g↓, a_B = a_C = 0

D

Solution
Question 3
4 / -1

Find normal contact force between 2kg & 3kg blocks. Three blocks are pushed toward right as shown :-

A
30 N

B
7.5 N

C
6 N

D
15 N

Solution

30 = 6a, N = 3a
Question 4
4 / -1

An air capacitor having capacity C₀ is filled with dielectric as shown in figure, then the new capacitance of system will be

A
C₀

B
2C₀

C
3C₀

D
4C₀

Solution
Question 5
4 / -1

In the circuit shown here C₁ = 6μF, C₂ = 3μF and battery B = 20 V. The switch S₁ is first closed. It is then opened and afterwards S₂ is closed. What is the charge on C₂

A
120 μC

B
80 μC

C
40 μC

D
20 μC

Solution
Question 6
4 / -1

Two air filled capacitors are connected as shown. The left capacitor is suddenly filled with a dielectric of constant K. The work done by battery after that is 24µJ. Dielectric constant K is :-

A
2

B
3

C
4

D
6

Solution
Question 7
4 / -1

A parallel plate capacitor is charged and then disconnected from the source of steady E.M.F. The plates are then drawn apart farther. Again it is connected to the same source. Then :

A
the potential difference across the plate increases, while the plates are being drawn apart.

B
the charge from the capacitor flows into the source, when the capacitor is reconnected.

C
more charge is drawn to the capacitor from the source, during the reconnection.

D
option 1 and option 2 are correct
Question 8
4 / -1

Circuit shown in the figure is in steady state. Now the capacitor is suddenly filled with medium of dielectric constant K = 2.

A
Current through battery just after this moment is

B
Current through '2R' just after this moment is

C
Potential difference across capacitor just after this moment is

D
All are correct

Solution
Question 9
4 / -1

Acceleration of blocks at given instant are a shown in the figure. Coefficient of friction between 10kg block and ground is 0.1. There is no friction between 5kg blocks and ground. Which of the following statements is/are CORRECT.

A
Force in spring A is 5N

B
Force in spring B is 15 N

C
Acceleration of block of mass 10 kg is 1 m/s².

D
All are correct

Solution
Question 10
4 / -1

A block of mass m₁ = 2 kg and another block of mass m₂ = 3kg, are placed together (see figure) on an inclined plane with angle of inclination θ. The coefficient of static and dynamic friction between the block m₁ and the plane is always µ = 0.2. The coefficient of static and dynamic friction between the block m₂ and the plane are equal to µ = 0.3.

A
Minimum angle at which both block start moving together is tan^–113/50.

B
Maximum angle up to which normal reaction between blocks remains 0 is tan^–11/5.

C
At the angle 37° acceleration of both block is approximately 4 m/s².

D
All are correct

Solution