CRT 4 (CBSE 10th) - Assessment

1.

Multiple Choice

3 mins

1 pt

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

2 mins

1 pt

The north pole of Earth’s magnet is in :

Geographical East

Geographical South

Geographical West

Geographical North

3.

Multiple Choice

3 mins

1 pt

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

4.

Multiple Choice

3 mins

1 pt

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

2 mins

1 pt

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

3 mins

1 pt

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

3 mins

1 pt

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

1 min

1 pt

Who has stated the Right hand Thumb Rule?

Orsted

Fleming

Einstein

Maxwell

9.

Multiple Choice

3 mins

1 pt

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

3 mins

1 pt

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

3 mins

1 pt

If one root of the quadratic equation 2x² + kx – 6 = 0 is 2, the value of k is

12.

Multiple Choice

3 mins

1 pt

The roots of the quadratic equation

a, b

-a, b

a, -b

-a, -b

13.

Multiple Choice

3 mins

1 pt

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

3 mins

1 pt

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.

15.

Fill in the Blank

3 mins

1 pt

Find the value of p so that the quadratic equation px(x – 3) + 9 = 0 has two equal roots.

16.

Fill in the Blank

1 min

1 pt

Find the value(s) of k so that the quadratic equation $x^2$ – 4kx + k = 0 has equal roots.

17.

Multiple Choice

3 mins

1 pt

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

18.

Fill in the Blank

3 mins

1 pt

Find the value of p, for which one root of the quadratic equation p $x^2$ – 14x + 8 = 0 is 6 times the other.

19.

Fill in the Blank

3 mins

1 pt

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

20.

Multiple Choice

1 min

1 pt

A bi-quadratic equation has degree

1

2

3

4

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