Which of the following is vector quantity
|
(a) Current density |
(b) Current |
(c) Wattless current |
(d) Power |
Which of the following is vector quantity
|
(a) Current density |
(b) Current |
(c) Wattless current |
(d) Power |
(a) Current density
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In Thomson spectrograph experiment, four positive ions P,Q,R and S are situated on Y-X curve a shown in the figure

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(a) The specific charge of R and S are same |
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(b) The masses of P and S are same |
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(c) The specific charges of Q and R are same |
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(d) The velocities of R and S are same |
Assertion : A red object appears dark in the yellow light
Reason : A red colour is scattered less
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
The measurement of voltmeter in the following circuit is
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(a) 2.4 V |
(b) 3.4 V |
(c) 4.0 V |
(d) 6.0 V |
A 36 W galvanometer is shunted by resistance of 4W. The percentage of the total current, which passes through the galvanometer is
|
(a) 8 % |
(b) 9 % |
(c) 10 % |
(d) 91 % |
Threshold frequency for a metal is
Hz. Light of
falls on its surface. Which of the following statements is correct
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(a) No photoelectric emission takes place |
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(b) Photo-electrons come out with zero speed |
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(c) Photo-electrons come out with 103 m/sec speed |
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(d) Photo-electrons come out with 105 m/sec speed |
An alpha particle is accelerated through a potential difference of
. Its kinetic energy will be
|
(a) 1 MeV |
(b) 2 MeV |
(c) 4 MeV |
(d) 8 MeV |
The electric intensity due to a dipole of length 10 cm and having a charge of 500μC, at a point on the axis at a distance 20 cm from one of the charges in air, is
|
(a) 6.25 |
(b) 9.28 |
(c) 13.1 |
(d) |