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- 1. Multiple Choice
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
- 2. Multiple Choice
The north pole of Earth’s magnet is in :
Geographical East
Geographical South
Geographical West
Geographical North
- 3. Multiple Choice
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) 45o
(b) 60o
(c) 90o
(d) 180o
60o
180o
90o
45o
- 4. Multiple Choice
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
- 5. Multiple Choice
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
- 6. Multiple Choice
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
- 7. Multiple Choice
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
- 8. Multiple Choice
Who has stated the Right hand Thumb Rule?
Orsted
Fleming
Einstein
Maxwell
- 9. Multiple Choice
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
- 10. Multiple Choice
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
- 11. Fill in the Blank
If one root of the quadratic equation 2x² + kx – 6 = 0 is 2, the value of k is
- 12. Multiple Choice
The roots of the quadratic equation
a, b
-a, b
a, -b
-a, -b
- 13. Multiple Choice
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
- 14. Fill in the Blank
If 1 is a root of the equations a + ay + 3 = 0 and y2 + y + b = 0, then find the value of ab.
- 15. Fill in the Blank
Find the value of p so that the quadratic equation px(x – 3) + 9 = 0 has two equal roots.
- 16. Fill in the Blank
Find the value(s) of k so that the quadratic equation – 4kx + k = 0 has equal roots.
- 17. Multiple Choice
If x = 2/3 and x = -3 are roots of the quadratic equation a + 7x + b = 0, find the values of a and b.
3,-6
-6,3
4,6
6,4
- 18. Fill in the Blank
Find the value of p, for which one root of the quadratic equation p – 14x + 8 = 0 is 6 times the other.
- 19. Fill in the Blank
Find the value of m for which the roots of the equation. mx (6x + 10) + 25 = 0, are equal.
- 20. Multiple Choice
A bi-quadratic equation has degree
1
2
3
4
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