For measurement of potential difference, potentiometer is preferred in comparison to voltmeter because
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(a) Potentiometer is more sensitive than voltmeter |
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(b) The resistance of potentiometer is less than voltmeter |
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(c) Potentiometer is cheaper than voltmeter |
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(d) Potentiometer does not take current from the circuit |
(d) Potentiometer does not take current from the circuit
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Assertion : A star which appears blue will be much hotter than the sun
Reason : It is based on Wien'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. |
Infinite charges of magnitude q each are lying at x =1, 2, 4, 8... meter on X-axis. The value of intensity of electric field at point x = 0 due to these charges will be
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(a) 12 ×109q N/C |
(b) Zero |
(c) 6 × 109q N/C |
(d) 4 × 109q N/C |
A light ray from air is incident (as shown in figure) at one end of a glass fiber (refractive index m = 1.5) making an incidence angle of 60o on the lateral surface, so that it undergoes a total internal reflection. How much time would it take to traverse the straight fiber of length 1 km
| (a) 3.33 m sec | (b) 6.67 m sec | (c) 5.77 m sec | (d) 3.85 m sec |
A storage cell is charged by 5 amp D.C. for 18 hours. Its strength after charging will be
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(a) 18 AH |
(b) 5 AH |
(c) 90 AH |
(d) 15 AH |