A device which converts electrical energy into mechanical energy is
Options
(a) Electric motor (b) Induction coil (c) Dynamo (d) Generator
Correct Answer:
Electric motor
Explanation:
No explanation available. Be the first to […]
The energy of groundstate (n=1) of hydrogen level is -13.6 eV. The ionistation potential of the hydrogen atom is
Options
(a) (-13.6 eV) (b) (13.6 V) (c) (+13.6 eV) (d) more than (-13.6 […]
A and B are two metals with threshold frequencies 1.8 x 10¹⁴ Hz and 2.2 x 10¹⁴ Hz. Two identical photons of energy 0.825 eV each are incident on them. Then photoelectrons are emitted in […]
An electron is
Options
(a) Hardon (b) Baryon (c) a nucleon (d) a lepton
Correct Answer:
a lepton
Explanation:
No explanation available. Be the first to write the explanation for this question by […]
A certain current on passing through a galvanometer produces a deflection of 100 divisions. When a shunt of one ohm is connected, the deflection reduces to division. The galvanometer resistance is
Options
(a) […]
A 1m long wire of diameter 0.31 mm has a resistance of 4.2Ω. If it is replaced by another wire of same material of length 1.5m and diameter 0.155 mm, then the resistance of wire […]
₆C¹⁴ absorbs an energitic neutron and emits beta particles. The resulting nucleus is
Options
(a) ₇N¹⁴ (b) ₇N¹³ (c) ₅B¹³ (d) ₆C¹³
Correct Answer:
₇N¹³
Explanation:
No explanation available. Be the first to […]
A step down transformer is used on a 1000 V line to deliver 20 A at 120 V at the secondary coil. If the efficiency of the transformer is 80%, the current drawn from the […]
The dimensions of pressure are equal to those of
Options
(a) Force per unit volume (b) Energy per unit volume (c) Force (d) Energy
Correct Answer:
Energy per unit volume
Explanation:
No explanation […]
Planck’s constant has same dimensions as those of
Options
(a) Angular momentum (b) Linear momentum (c) Work (d) Coefficient of viscocity
Correct Answer:
Angular momentum
Explanation:
No explanation available. Be the first to […]
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