An ammeter whose resistance is 180 Ω gives full scale deflection when current is 2 mA. The shunt required to convert it into an ammeter reading 20 mA (in ohms) is
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(a) 18 |
(b) 20 |
(c) 0.1 |
(d) 10 |
(b) 20
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The hottest planet of solar system is
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(a) Mars |
(b) Mercury |
(c) Venus |
(d) Pluto |
A man runs towards a mirror at a speed 15 m/s The speed of the image relative to the man is
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(a) 15 |
(b) 30 |
(c) 35 |
(d) 20 |
Assertion : X-rays cannot be diffracted by means of grating.
Reason : X-rays does not obey Bragg's law.
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(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. |
In order to coincide the parabolas formed by singly ionised ions in one spectrograph and doubly ionized ions in the other Thomson’s mass spectrograph, the electric fields and magnetic fields are kept in the ratios 1 : 2 and 3 : 2 respectively. Then the ratio of masses of the ions is
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(a) 3 : 4 |
(b) 1 : 3 |
(c) 9 : 4 |
(d) None of these |
Assertion : Red shift confirms that the universe is expanding
Reason : Wavelength of red light is maximum in the visible region
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(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. |
In the following circuits PN-junction diodes D1, D2 and D3 are ideal for the following potential of A and B, the correct increasing order of resistance between A and B will be
(i) – 10 V, – 5V (ii) – 5V, – 10 V (iii) – 4V, – 12V
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(a) (i) < (ii) < (iii) |
(b) (iii) < (ii) < (i) |
(c) (ii) = (iii) < (i) |
(d) (i) = (iii) < (ii) |
If in Rutherford’s experiment, the number of particles scattered at 90° angle are 28 per min, then number of scattered particles at an angle 60° and 120° will be
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(a) 112/min, 12.5/min |
(b) 100/min, 200/min |
(c) 50/min, 12.5/min |
(d) 117/min, 25/min |
