A wire of resistance 4 ohm is stretched to twice its original length. The resistance of stretched wire would be
Options
(a) 4Ω (b) 8Ω (c) 16Ω (d) 2Ω
Correct Answer:
16Ω
Explanation:
Resistance […]
The resistances of the four arms P,Q,R and S in a Wheatstone’s bridge are 10Ω, 30Ω, 30Ωand 90Ω respectively. The emf and internal resistance of the cell are 7V and 5Ω, respectively. If the galvanometer […]
When 4 A current flows for 2 min in an electroplating experiment, then m gram of silver is deposited. Then the amount (in gram) of silver deposited by 6 A current flowing for 40 s […]
The half life of a radioactive isotope ‘X’ is 20 years. It decays to another element ‘Y’ which is stable. The two elements ‘X’ and ‘Y’ were found to be in the ratio of 1 […]
The ratio of longest wavelength corresponding to Lyman and Blamer series in hydrogen spectrum is
Options
(a) 3 / 23 (b) 7 / 29 (c) 9 / 13 (d) 5 / 27
Correct […]
A certain mass of Hydrogen is changed to Helium by the process of fusion. The mass defect in fusion reaction is 0.02866 a.m.u. The energy liberated per a.m.u. is (Given : 1 a.m.u. = 931 […]
A coil of self-inductance L is connected in series with a bulb B and an AC source. Brightness of the bulb decreases when
Options
(a) number of turns in the coil is reduced […]
Ratio of longest wavelengths corresponding to Lyman and Balmer series in hydrogen spectrum is
Options
(a) (5/27) (b) (3/23) (c) (7/29) (d) (9/31)
Correct Answer:
(5/27)
Explanation:
No explanation available. Be the first […]
A stone falls freely under gravity. It covers distances h1, h2 and h3 in the first 5 seconds,the next 5 seconds and the next 5 seconds respectively. The relation between h1, h2 and h3 is […]
Select the wrong statement
Options
(a) Anisogametes differ either in structure, function or behaviour (b) In omycetes female gamete is smaller and motile, while male gamete is larger and non-motile (c) Chlamydomonas exhibits […]
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