Physics Test 169

Result

Physics Test 169

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Weekly Quiz Competition

Question 1
4 / -1

A
8 V-m

B
12 V-m

C
20 V-m

D
0

Solution
Question 2
4 / -1

Two spherical conductors A and B of radii a and b (b>a) are placed concentrically in air. The two are connected by a copper wire as shown in figure. Then the equivalent capacitance of the system is

A

B

C

D

Solution
Question 3
4 / -1

The length of a wire of a potentiometer is 100 cm, and the e.m.f. of its standard cell is E volt. It is employed to measure the e.m.f. of a battery whose internal resistance is 0.5W. If the balance point is obtained at l = 30 cm from the positive end, the e.m.f. of the battery is

A

B

C

D

Solution
Question 4
4 / -1

A long insulated copper wire is closely wound as a spiral of ‘ N’ turns. The spiral has inner radius ‘a’ and outer radius ‘b’. The spiral lies in the XY plane and a steady current ‘I’ flows through the wire. The Z-component of the magnetic field at the centre of the spiral is

A

B

C

D

Solution

Let us consider a thickness dx of wire. Let it be at a distance x from the centre O.
Question 5
4 / -1

A bar magnet of moment of inertiaplaced in a vibration magnetometer and oscillating in a uniform magnetic field makes 20 oscillations in 15 s. The magnetic moment of the bar magnet is

A
3 Am²

B
2 Am²

C
5 Am²

D
4 Am²

Solution
Question 6
4 / -1

Directions For Questions

In fig, CODF is a semicircular loop of a conducting wire of resistance R and radius r. It is placed in a uniform magnetic field B, which is directed into the page (perpendicular to the plane of the loop).

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The loop is rotated with a constant angular speed w about an axis passing through the centre O, and perpendicular to the page. Then the induced current in the wire loop is

A
0

B

C

D

Solution
Question 7
4 / -1

A
120 volts

B
220 volts

C
30 volts

D
90 volts

Solution
Question 8
4 / -1

Which of the following electromagnetic waves has minimum frequency?

A
Microwaves

B
Audible waves

C
Ultrasonic wave

D
Radiowaves

Solution

Audible waves are not electromagnetic wave.
Question 9
4 / -1

A rectangular glass slab ABCD of refractive index n1 is immersed in water of refractive index A ray of light is incident at the surface AB of the slab as shown. The maximum value of the angle of incidence max such that the ray comes out only from the other surface CD is given by

A

B

C

D

Solution

The ray will come out from CD if it suffers total internal reflection at surface AD, i.e. it strikes the surface AD at critical angle C (the limiting case).
Question 10
4 / -1

Two coherent point sources S₁ and S₂ are separated by a small distance d as shown. The fringes obtained on the vertical screen will be

A
points

B
straight bands

C
concentric circles

D
semicircles