NEET Physics: Questions 1008 - 1011 of 2099
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Question number: 1008
A series LCR arrangement with X L =80Ω, X C = 50Ω, R = 40Ω is applied across a. c. source of 200 V. Choose the correct options.
(1) Wattless current = 3.2 A
(2) Power current = 3.2 A
(3) Power factor = 0.6
(4) Impedance of circuit = 50 Ω
Select the correct answers and mark it according to the following codes:
1 and 3 are correct
2 and 4 are correct
1, 2 and 3 are correct
1 and 2 are correct
Question number: 1009
Ultraviolet radiations are of higher frequency waves and are dangerous to human being.
Ultraviolet radiations are absorbed by the atmosphere.
|a.||Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ|
|b.||Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ|
|c.||Both Ꭺ and Ꭱ are false|
|d.||Ꭺ is true but Ꭱ is false|
Question number: 1010
The coefficient of induction of a choke coil is 0.1 H and resistance is 12Ω. If it is connected to an alternating current source of frequency 60 Hz, then power factor is approximately
Question number: 1011
For an electric lamp connected in series with a variable capacitor and ac source, its brightness increases with increase in capacitance.
Capacitive reactance decreases with increase in capacitance of capacitor.
|a.||Ꭺ is true but Ꭱ is false|
|b.||Ꭺ is false but Ꭱ is true|
|c.||Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ|
|d.||Both Ꭺ and Ꭱ are false|