Two conducting spheres of radii 5 cm and 10 cm are given a charge of 15 μC each. After the two spheres are joined by a conducting wire, the charge on the smaller sphere is […]
An electric motor operating on a 60 volt D.C supply draws a current of 10 amp. If the efficiency of the motor is 50%, the resistance of its windings is
Options
(a) 3 ohm […]
An a.c. supply gives 30 volt r.m.s which passes through a 10Ω resistance. The power dissipated in it is
Options
(a) 90 W (b) 90√2 W (c) 45 W (d) 45√2 W
Correct […]
According to photon theory of light which of the following physical quantities, associated with a photon, do not/does not change as it collides with an electron in vacuum
Options
(a) Speed and momentum […]
If ∆Q>0 when heat flows into a system, ∆W>0 when work is done on the system, then the increase in the internal energy ∆U is
Options
(a) ∆W+∆Q (b) ∆W-∆Q (c) ∆Q-∆W (d) […]
Which of the following hydrides is electron deficient molecule?
Options
(a) CH₄ (b) NaH (c) B₂H₆ (d) CaH₂
Correct Answer:
B₂H₆
Explanation:
No explanation available. Be the first to write the explanation for […]
The gas which combin with haemoglobin to damage its oxygen carrying capacity is
Options
(a) co (b) CO₂ (c) N₂ (d) O₂
Correct Answer:
co
Explanation:
No explanation available. Be the first to […]
Which of the following is obdained when acetone is treated with bleaching powder
Options
(a) CCl₄ (b) CHCl₃ (c) CH₂Cl₂ (d) CH₃Cl
Correct Answer:
CHCl₃
Explanation:
No explanation available. Be the first to […]
The compoumd which has one isopropyl groups is
Options
(a) 2,2,3,3-tetramethylpentane (b) 2,2-dimethylpentane (c) 2,2,3-trimethylpentane (d) 2-methylpentane
Correct Answer:
2-methylpentane
Explanation:
No explanation available. Be the first to write the explanation for this […]
The population dynamics of a species is basically regulated by
Options
(a) climate (b) food supply (c) competition between and within the species (d) all of the above
Correct Answer:
all of the […]
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