Question # 1

To hear echoes, the minimum distance of the obstacle from source of sound should be:

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10 m

15 m

17 m

20 m

An object gains excess negative charge after being rubbed against another object, which is:

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Neutral

Negatively charged

Charged

Either, a,b,and c

Totally reflecting prism is used in:

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periscope

binoculars

periscope and binocular

telescope

The number of lines of force in a magnetic field depends upon.

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Shape of coil

Sixe of coil

Magnet

Strength of field

A positive and negative charges are initially 4 cm apart. When they are moved closer together so that they are now only 1 cm apart, the force between them is:

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4 times smaller than before

4 times larger than before

8 times larger than before

16 times larger than before.

If the change of current in a circuit induces a current in another circuit, this phenomena is known as:

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Self induction

Mutual induction

Electromagnetic induction

None mutual induction

The half life of radium 226 is

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1600 year

1610 years

1620 years

1630 years

The amount of current that can be painful is:

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0.005A

0.001A

1A

2A

The force applied on the mass attached with a spring is represented by:

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f_a

f_c

f_ext

f_s

Ultrasound waves carry energy:

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Less

More

Equal

None of these

The galvanometer has been named after the scientist:

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Lewis

Lowry bronsted

Luigi Galvano

Galvano Einstein

Two uncharged objects a and b are rubbed against each other. When object b is placed near a negatively charged object c, the two objects repel each other. Which of these statements is true about object a:

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Remains uncharged

Becomes positively charged

Becomes negatively charged

Unpredictable

In electric motor, the brushes are made of:

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Lead

Graphite

Iron

Wood

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10th Class Physics English Medium KPK Boards Online Mcqs MCQs With Answers

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