MCQ
Density of nucleus is about :
- A$2.29 \times 10^7 kg m ^{-3}$
- B$2.29 \times 10^{-7} kg m ^{-3}$
- ✓$2.29 \times 10^{17} kg m ^{-3}$
- D$2.29 \times 10^{-17} kg m ^{-3}$
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For driving a current of 2 A for 6 minutes in a circuit, 1000 J of work is to be done. The e.m.f. of the source in the circuit is
|
(a) 1.38 V |
(b) 1.68 V |
(c) 2.04 V |
(d) 3.10 V |
Broadcasting antennas are generally
|
(a) Omnidirectional type |
(b) Vertical type |
(c) Horizontal type |
(d) None of these |
Which of the following helps us in the determination of the temperature of sun
|
(a) Kirchhoff's law |
(b) Maxwell Boltzmann law |
|
(c) Planck's law |
(d) Stefan's law |