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- Multiple ChoicePlease save your changes before editing any questions.
Commercial electric motors do not use

An electromagnet to rotate the armature

Effectively large number of turns of conducting wire in the current carrying coil

A permanent magnet to rotate the armature

A soft iron core on which the coil is wound

- Multiple ChoicePlease save your changes before editing any questions.
The north pole of Earth’s magnet is in :

Geographical East

Geographical South

Geographical West

Geographical North

- Multiple ChoicePlease save your changes before editing any questions.
The force exerted on a current carrying wire placed in a magnetic field is zero when the angle between wire and the direction of magnetic field is:

(a) 45

^{o}(b) 60

^{o}(c) 90

^{o}(d) 180

^{o}60

^{o}180

^{o}90

^{o}45

^{o} - Multiple ChoicePlease save your changes before editing any questions.
A Negative charge is moving towards a person. The direction of magnetic field lines will be in

Clockwise direction

Anticlockwise direction

Vertically upward direction

Vertically downward direction

- Multiple ChoicePlease save your changes before editing any questions.
An electric motor is a device which transforms

Mechanical energy into electrical energy

Electrical energy into mechanical energy

Kinetic energy into potential energy

Electrical energy into Potential energy

- Multiple ChoicePlease save your changes before editing any questions.
A current flows in a wire running between the S and N poles of a magnet lying horizontally as shown in the figure given.

The force on the wire due to the magnet is directed:

From N to S

From S to N

Vertically downwards

Vertically upwards

- Multiple ChoicePlease save your changes before editing any questions.
No force acts on a current carrying conductor when it is placed-

perpendicular to the magnetic field

parallel to the magnetic field

far away from the magnetic field

inside a magnetic field

- Multiple ChoicePlease save your changes before editing any questions.
Who has stated the Right hand Thumb Rule?

Orsted

Fleming

Einstein

Maxwell

- Multiple ChoicePlease save your changes before editing any questions.
What is the condition of an electromagnetic induction?

there must be a relative motion between the coil of wire and galvanometer

there must be a relative motion between

there must be a relative motion between galvanometer and generator

there must be a relative motion between the coil of wire and a magnet

- Multiple ChoicePlease save your changes before editing any questions.
The strength of magnetic field inside a long current carrying straight solenoid is

more at the ends than at the centre

minimum in the middle

same at all points

found to increase from one end to the other

- Fill in the BlankPlease save your changes before editing any questions.
If one root of the quadratic equation 2x² + kx – 6 = 0 is 2, the value of k is

- Multiple ChoicePlease save your changes before editing any questions.
The roots of the quadratic equation

a, b

-a, b

a, -b

-a, -b

- Multiple ChoicePlease save your changes before editing any questions.
If the roots of the equations ax² + 2bx + c = 0 and bx² – 2√ac x + b = 0 are simultaneously real, then

b = ac

b2 = ac

a2 = be

c2 = ab

- Fill in the BlankPlease save your changes before editing any questions.
If 1 is a root of the equations a $y^2$ + ay + 3 = 0 and y2 + y + b = 0, then find the value of ab.

- Fill in the BlankPlease save your changes before editing any questions.
Find the value of p so that the quadratic equation px(x – 3) + 9 = 0 has two equal roots.

- Fill in the BlankPlease save your changes before editing any questions.
Find the value(s) of k so that the quadratic equation $x^2$ – 4kx + k = 0 has equal roots.

- Multiple ChoicePlease save your changes before editing any questions.
If x = 2/3 and x = -3 are roots of the quadratic equation a $x^2$ + 7x + b = 0, find the values of a and b.

3,-6

-6,3

4,6

6,4

- Fill in the BlankPlease save your changes before editing any questions.
Find the value of p, for which one root of the quadratic equation p $x^2$ – 14x + 8 = 0 is 6 times the other.

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Find the value of m for which the roots of the equation. mx (6x + 10) + 25 = 0, are equal.

- Multiple ChoicePlease save your changes before editing any questions.
A bi-quadratic equation has degree

1

2

3

4