Physics Test 150

Result

Physics Test 150

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

Figure shows a battery circuit with an unknown resistance x. If the value of x for maximum power dissipation in unknown resistance is (n is an integer); find n.

A
2

B
3

C
4

D
12

Solution
Question 2
4 / -1

A point charge 'q' is placed at a distance 'ℓ' (on the y-axis) vertically above the surface which lies in the xz plane as shown in the figure. The flux of electric field passing through the plate is :

A

B

C

D

Solution
Question 3
4 / -1

The capacitance of the system is C. If the key K is closed, the total energy loss is equal to :

A
Q²/ 2C

B
2Q²/ C

C
Q²/ C

D
None of these
Question 4
4 / -1

A trolley of mass 18 kg is pulled with a velocity which depends on time and given as v = 3t. Sand is falling vertically on the trolley at a rate of 18 kg/s. Assume sand sticks to the trolley. If rate of increase of Kinetic energy of the trolley at t = 2 sec is η × 324, find the value of η.

A
3

B
4

C
5

D
6

Solution
Question 5
4 / -1

There are N number of resistors each of resistance R connected between the centre and periphery of a conducting ring. The effective resistance between A and B is :

A
NR

B
R / N²

C
R / N

D
Zero
Question 6
4 / -1

A ball rolls without slipping down an inclined plane as shown in the diagram. Which of the following vectors best represents the direction of the total force that the ball exerts on the plane ?

A

B

C

D
Question 7
4 / -1

Pure Si at 300 K have equal electron (n_e) and hole (n_h) concentrations of 1.5 × 10¹⁶ m^–3. Doping by indium increases n_h to 4.5 × 10²² m^–3. Calculate n_e in the doped Si.

A
(5 × 10⁹ m^–3)

B
(5 × 10⁸ m^–3)

C
(2 × 10⁹ m^–3)

D
(8 × 10⁹ m^–3)

Solution

We know that for a doped semiconductor in thermal equilibrium, we have

n_en_h = n_i²

As per given data,

n_i = 1.5 × 10¹⁶ m^–3

n_h = 4.5 × 10²² m^–3
Question 8
4 / -1

If the dimension of a physical quantity EB / μ is M^a L^b T^c. Find the value of (b-c / a). Here

E ⇒ magnitude of electric field,

B ⇒ magnitude of magnetic field,

m ⇒ Permeability of medium.

A
2

B
3

C
4

D
5

Solution
Question 9
4 / -1

A solid ball is released from rest down inclines of various inclination angles θ but through a fixed vertical height h. The coefficient of static and kinetic friction are both equal to μ. Which of the following graphs best represents the total kinetic energy of the ball at the bottom of the incline as a function of the angle of the incline ?

A

B

C

D
Question 10
4 / -1

The moment of inertia of the dumbbell consisting of two identical uniform solid spheres of mass m and radius R each, joined by a metallic rod of equal mass m (separation between the centres of the spheres is 6R) is I about the axis AB. Its moment of inertia, about an axis making an angle of 45° with AB, is.

A

B

C
31 I

D

Solution