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Physics - Current Electricity

Avatto > > NTSE > > Practice Questions Ntse > > Physics > > Current Electricity

66. An ammeter and a voltmeter are joined in series to a cell. Their readings are A and V respectively. If a resistance is now joined in parallel with the voltmeter, then (NTSE Andhra Pradesh, Stage-I, 2016-17)

A
A will increase, V will decrease
B
Both A and V will increase
C
Both A and V will decrease
D
A will decrease, V will increase

Answer
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Option : A
Explanation :

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67. A galvanometer is used to measure small currents. A certain galvanometer has a resistance 500 Ω and gives a full-scale deflection for a current of 200 μA. This meter is connected as shown in the figure to make a multi range current meter.

Connection to the circuit is made at the terminals shown. The currents in the external circuit needed to give full scale deflections when X is connected to A, Band C in turn are shown in the table.

X connected to	Current in the external circuit (mA)
A	1
B	10
C	100

The value of R₃ is (NTSE Andhra Pradesh, Stage-I, 2016-17)

A
2.25 Ω
B
0.25 Ω
C
1.25 Ω
D
3.25 Ω

Answer
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Option : C
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68. The work done in moving 10 lithium nuclei (Atomic number of Li = 3) through a potential difference of 10 V is : Charge on an electron is 1.6 x 10^-19 C) (NTSE Maharashtra, Stage-I, 2016-17)

A
4.8 x 10^-16 J
B
4.8 x 10^-19 J
C
4.8 x 10^-18 J
D
4.8 x 10^-17 J

Answer
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Option : D
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69. Fuse wire should be placed in the path of ..... wire. (NTSE Maharashtra, Stage-I, 2015-16)

A
Neutral
B
Phase
C
Earth
D
None of these

Answer
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Option : B
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70. The average drift velocity of electrons in a wire not connected to a cell is (NTSE Maharashtra, Stage-I, 2015-16)

A
Zero
B
Always positive
C
Infinite
D
Always negative

Answer
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Option : A
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Practice Questions Ntse

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