8 marks] [total: 9]

Test (Unit 17)

17 M

:................................................................................................................

:........................................................ Code: 5054 Class: CII

urn over[T

heory Section:

T [Total arks]

Time Allowed: 35Minutes

Maximum Marks: 25

NIQUE SCIENCE ACADEMY

U

Date

Name

Paper: Physics

1

Dedicated to My Son Mohammad Irtaza Zain. Code 5054

On Fig. 1.1, mark the signs of the charges induced at end X and at end Y of conductor B.

Conductor A is given the positive charge shown on Fig. 1.1.

Fig. 1.1

In Fig. 1.1, A and B are two conductors on insulating stands. Both A and B were initially 1 uncharged.

A B

X Y

(a)

(i) [1]

(ii) Explain how these charges are induced.

...........................................................................................................................................

...........................................................................................................................................

..................................................................................................................................... [3]

(iii) Explain why the charges at X and at Y are equal in magnitude.

...........................................................................................................................................

...........................................................................................................................................

..................................................................................................................................... [1]

(b) B is now connected to earth by a length of wire.

Explain what happens, if anything, to

(i) the charge at X,

...........................................................................................................................................

..................................................................................................................................... [1]

(ii) the charge at Y.

...........................................................................................................................................

..................................................................................................................................... [2] [Total: 8]

urn over[TDedicated to My Son Mohammad Irtaza Zain. Code 5054

2

Fig. 2.1

rod is held close to the suspended table-tennis ball shown in Fig. 2.1. The table-tennis

2 (a) State the law of attraction and repulsion between electrostatic charges.

..........................................................................................................................................

..........................................................................................................................................

.................................................................................................................................... [2]

(b) Sometimes, when people have been riding in a car, they get an electric shock from the door handle as they get out of the car.

Suggest why this happens.

..........................................................................................................................................

..........................................................................................................................................

.................................................................................................................................... [2]

(c) A plastic rod is rubbed with a cloth and becomes positively charged. After charging, the

ball is covered with metal paint and is initially uncharged.

positivelycharged rod

lighttable-tennis ball

covered with metalpaint

nylon thread

(i) Describe what happens to the charges on the metal-painted table-tennis ball as the positively-charged rod is brought close to the ball.

..................................................................................................................................

..................................................................................................................................

............................................................................................................................ [1]

2

1

urn over[TDedicated to My Son Mohammad Irtaza Zain. Code 5054

3

(ii) The ball is attracted towards the charged rod.

Explain why this happens.

..................................................................................................................................

..................................................................................................................................

............................................................................................................................ [2]

(iii) When it is a few centimetres away from the rod, the ball is briefly touched by a wire connected to earth.

In terms of the movement of charges, describe what happens to the charge on the ball.

..................................................................................................................................

............................................................................................................................ [2]

[Total: 9]8 MCQ SECTION: [Total Marks] A polythene rod repels an inflated balloon hanging from a nylon thread.

What charges must the rod and the balloon carry?

A The rod and the balloon carry opposite charges.

B The rod and the balloon carry like charges.

C The rod is charged but the balloon is not.

D The balloon is charged but the rod is not.

To charge an isolated metal sphere by induction, the following four processes are required.

P The sphere is earthed by touching it.

Q The earth connection is removed from the sphere.

R A charged rod is brought close to the sphere.

S The charged rod is removed.

In which order can these stages be carried out to charge the isolated metal sphere?

A P → Q → R → S

B P → R → S → Q

C R → P → Q → S

D R → P → S → Q

On a stormy day, a large, negatively-charged cloud is above a tree.

4

3

4

Dedicated to My Son Mohammad Irtaza Zain. Code 5054 [Turn over

positively charged particles move up the tree

positively charged particles move down the tree

negatively charged particles move up the tree

negatively charged particles move down the tree

negative

positive

-----

-- -

An electrical charge is induced on the tree as charged particles flow through it.

cloud

tree

ground

What is the charge induced on the tree and how do the charged particles move?

charge on tree movement of charged particles through tree

A

B

C

D

-----

-- -

positive

negative

A metal ball is charged by induction. To do this, a charged rod is held close to one side of the balland the other side is earthed.

Which diagram shows the charge distribution at this stage of the experiment?

nocharge

A

+ ++ +

B

+ ++ +

C

+ ++ +

D

+ ++ +

++++

6

5

5


negative

XY

The diagram shows a positively charged acetate strip and a negatively charged polythene strip that are freely suspended.

acetate strip

++

++

polythene strip

––

––

Two rods X and Y are brought up in turn to these two strips. Rod attracts the acetate strip but repels the polythene strip. Rod does not repel either the acetate strip or the polythene strip.

Which type of charge is on each rod?

rod X rod Y

A

B

C

D

negative

negative

positive

positive

uncharged

uncharged

negative

In an electrostatics experiment, a plastic rod is rubbed with a cloth. The cloth becomes negatively charged.

Which diagram shows the charge on the rod, and describes the movement of charge?

A

cloth

rod

protons move from the cloth onto the rod

B

cloth

rod

electrons move from the rod onto the cloth

C

cloth

rod

electrons move from the cloth onto the rod

D

cloth

rod

protons move from the rod onto the cloth

[Turn over

6

8

7


What is thel charge, if any, on sphere Y?

A negatively-charged sphere X is brought up to an identical uncharged sphere Y. The spheres do not touch.

X Y

insulatingholder

–

– –

– –

– –

– –

– –

– –

– ––

A

–

– –

– –

– –

– –

– –

– –

– ––

B

+

+ +

+ +

+ +

+ +

+ +

+ +

+ ++

C D

+ –

+ –

+ –

+ –

+ –

+ –

+ –

Positive charges on the balloon repel the positive charges in the wall.

Positive charges on the balloon repel the negative charges in the wall.

Positive charges on the balloon have no effect on the charges in the wall.

Positive charges on the balloon attract the negative charges in the wall.

A positively-charged balloon is brought towards a wall.

Which statement explains what happens?

A

B

C

D

8 A B C D

7 A B C D

6 A B C D

5 A B C D

4 A B C D

3 A B C D

2 A B C D

1 A B C D

MCQ Answer Sheet

8 marks] [total: 9]

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