- AThey have the same particles in the nucleus.
- BThey are equally abundant in nature.
- CThey have the same number of protons
- DThey have the same mass.
Explanation:
Isotopes of the same element must have same number of protons but different number of neutrons and hence they have different mass.
Also the isotopes of same element are not equally abundant in nature.
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The V-i graph for a conductor makes an angle θ with V-axis. Here V denotes the voltage and i denotes current. The resistance of conductor is given by
|
(a) sin θ |
(b) cos θ |
(c) tan θ |
(d) cot θ |
Speed of light is maximum in
|
(a) Water |
(b) Air |
(c) Glass |
(d) Diamond |
A transformer is used to
|
(a) Change the alternating potential |
|
(b) Change the alternating current |
|
(c) To prevent the power loss in alternating current flow |
|
(d) To increase the power of current source |
Two magnets, each of magnetic moment ‘M’ are placed so as to form a cross at right angles to each other. The magnetic moment of the system will be
|
(a) 2M |
(b) |
(c) 0.5 M |
(d) M |
In the circuit as shown in the figure, the heat produced by 6 ohm resistance due to current flowing in it is 60 calorie per second. The heat generated across 3 ohm resistance per second will be
|
(a) 30 calorie |
(b) 60 calorie |
(c) 100 calorie |
(d) 120 calorie |
Hubble showed that the universe as a whole is expanding and the distant stars are receding from us. The spectral line from a star, when compared with the corresponding line from an source will then show
|
(a) A shift in frequency towards the red end |
|
(b) A shift in frequency towards the violet end |
|
(c) No shift in frequency at all |
|
(d) A shift in frequency towards the violet end as well as a decrease in intensity |
The rays of different colors fail to converge at a point after going through a converging lens. This defect is called _________.