Which of the following is a correct statement
|
(a) Beta rays are same as cathode rays |
|
(b) Gamma rays are high energy neutrons |
|
(c) Alpha particles are singly ionized helium atoms |
|
(d) Protons and neutrons have exactly the same mass |
(a) Beta rays are same as cathode rays
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Which of the following is an amorphous solid
|
(a) Glass |
(b) Diamond |
(c) Salt |
(d) Sugar |
The circuit shown in following figure contains two diode D1 and D2 each with a forward resistance of 50 ohms and with infinite backward resistance. If the battery voltage is 6 V, the current through the 100 ohm resistance (in amperes) is
| (a) Zero | (b) 0.02 | (c) 0.03 | (d) 0.036 |
Two condensers of capacities 1μF and 2 μF are connected in series and the system is charged to 120 volts. Then the P.D. on 1 μF capacitor (in volts) will be
|
(a) 40 |
(b) 60 |
(c) 80 |
(d) 120 |
Absorption of X-ray is maximum in which of the following different sheets
|
(a) Copper |
(b) Gold |
(c) Beryllium |
(d) Lead |
The inward and outward electric flux for a closed surface in units of 
are respectively 
and 
Then the total charge inside the surface is [where 
= permittivity constant]
|
(a) |
(b) - |
(c) |
(d) |
An alternating voltage of 141.4V (rms) is applied to a vacuum diode as shown in the figure. The maximum potential difference across the condenser will be
|
(a) 100 V |
(b) 200 V |
(c) 100 |
(d) 200 |
In a nuclear reactor, the fuel is consumed at the rate of 1 mg/s. The power generated in kilowatt is
(a) 9 
|
(b) 9 
|
(c) 9
|
(d) 9 
|
Light takes 8 min 20 sec to reach from sun on the earth. If the whole atmosphere is filled with water, the light will take the time (a
|
(a) 8 min 20 sec |
(b) 8 min |
(c) 6 min 11 sec |
(d) 11 min 6 sec |
