A radioactive element emits 200 particles per second. After three hours 25 particles per second are emitted. The half life period of element will be
|
(a) 50 minutes |
(b) 60 minutes |
(c) 70 minutes |
(d) 80 minutes |
(b) 60 minutes
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A real image is formed by:
The wave theory of light was given by
|
(a) Maxwell |
(b) Planck |
(c) Huygen |
(d) Young |
For what value of R the net resistance of the circuit will be 18 ohms
|
(a) 8 Ω |
(b) 10 Ω |
(c) 16 Ω |
(d) 24 Ω |
Two stars P and Q are observed at night. Star P appears reddish while, star Q is white. From this we conclude
|
(a) Temperature of Q is higher than that of P |
|
(b) Temperature of Q is lower than that of P |
|
(c) Star Q is at the same distance at that of star P |
|
(d) Star P is farther than star Q |
The capacitor of capacitance 4 μF and 6 μF are connected in series. A potential difference of 500 volts is applied to the outer plates of the two capacitor system. The potential difference across the plates of capacitor of 4 μF capacitance is
|
(a) 500 volts |
(b) 300 volts |
(c) 200 volts |
(d) 250 volts |