- ARemains precisely constant.
- BIncreases slightly.
- CDecreases slightly.
- DMay increase slightly or may decrease slightly.
Explanation:
If a body is charged by rubbing it, its weight may increase slightly or may decrease slightly.
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The slopes of anode and mutual characteristics of a triode are 0.02 mA V–1 and 1 mA V–1 respectively. What is the amplification factor of the valve
|
(a) 5 |
(b) 50 |
(c) 500 |
(d) 0.5 |
The fraction f of radioactive material that has decayed in time t, varies with time t. The correct variation is given by the curve
|
(a) A |
(b) B |
(c) C |
(d) D |
In a diode valve the cathode temperature must be (f = work function)
|
(a) High and ∅ should be high |
(b) High and ∅ should be low |
|
(c) Low and ∅ should be high |
(d) Low and ∅ should be high |
Frequency of a wave is 6 . The wave is
|
(a) Radiowave |
(b) Microwave |
(c) X-ray |
(d) None of these |
The ratio of minimum to maximum wavelength in Balmer series is
|
(a) 5 : 9 |
(b) 5 : 36 |
(c) 1 : 4 |
(d) 3 : 4 |
One cannot see through fog because .......... :