#### Electric Charge and Electric Current English Medium Free Online Test 1 Mark Questions 2020-2021

9th Standard

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Science

Time : 00:10:00 Hrs
Total Marks : 10

Part A

10 x 1 = 10
1. In current electricity, a positive charge refers to,

(a)

presence of electron

(b)

presence of proton

(c)

absence of electron

(d)

absence of proton

2. Electric field lines________ from positive charge and__________ in negative charge.

(a)

start; start

(b)

start; end

(c)

start: end

(d)

end; end

3. In an electrolyte the current is due to the flow of

(a)

electrons

(b)

positive ions

(c)

both (a) and (b)

(d)

neither (a) nor (b)

4. The following is not a safety device.

(a)

Fuse

(b)

Trip switch

(c)

Ground connection

(d)

Wire

5. Resistance of a wire depends on

(a)

temperature

(b)

geometry

(c)

nature of material

(d)

all the above

6. A current of 2A passing through conductor produces 80 J of heat in 10 seconds. The resistance of the conductor is__________

(a)

0.5$\Omega$

(b)

2$\Omega$

(c)

4$\Omega$

(d)

20$\Omega$

7. Two resistances R1 and R2 are connected is parallel. Their equivalent resistance is__________

(a)

R1+R2

(b)

$\cfrac { { R }_{ 1 }{ R }_{ 2 } }{ { R }_{ 1 }+{ R }_{ 2 } }$

(c)

$\cfrac { { R }_{ 1 }+{ R }_{ 2 } }{ { R }_{ 1 }{ R }_{ 2 } }$

(d)

$\sqrt { { R }_{ 1 }+{ R }_{ 2 } }$

8. The resistance of a conductor is R. If its length is doubled, then its new resistance will be_______________

(a)

R

(b)

2R

(c)

4R

(d)

8R

9. Assertion (A) Electric current will not flow between two charged bodies when connected if their charges are same.
Reason (R) Current is the rate of flow of charge.

(a)

If both assertion and reason are true and reason is the correct explanation of assertion

(b)

If both assertion and reason are true but reason is not the correct explanation of assertion.

(c)

If assertion is true but reason is false

(d)

If assertion is false but reason is true.

10. Assertion (A) : A bird perches on a high power line and nothing happens to the bird.
Reason (R) : The level of bird is very high from the ground.

(a)

If both assertion and reason are true and reason is the correct explanation of assertion.

(b)

If both assertion and reason are true but reason is not the correct explanation of assertion.

(c)

If assertion is true but reason is false

(d)

If assertion is false but reason is true