- Asum of A and B is Y.
- BY exists when A exists or B exists or both A and B exist.
- CY exists only when A and B both exist.
- DY exists when A or B exist but not when both A and B exist.
Explanation:
In Boolean algebra, A + B = Y implies that Y exists when A exists or B exists or both A and B exist.
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There is a current of 40 ampere in a wire of area of cross-section. If the number of free electron per
is
, then the drift velocity will be
|
(a) 1.25 × |
(b) 2.50 × |
(c) 25.0 × |
(d) 250 × |
The decay constant λ of the radioactive sample is the probability of decay of an atom in unit time, then
|
(a) λ decreases as atoms become older |
|
(b) λ increases as the age of atoms increases |
|
(c) λ is independent of the age |
|
(d) Behaviour of λ with time depends on the nature of the activity |
X-rays are known to be electromagnetic radiations. Therefore the X-ray photon has
| (a) Electric charge |
| (b) Magnetic moment |
| (c) Both electric charge and magnetic moment |
| (d) Neither electric charge nor magnetic moment |
When the light source is kept 20 cm away from a photo cell, stopping potential 0.6 V is obtained. When source is kept 40 cm away, the stopping potential will be
|
(a) 0.3 V |
(b) 0.6 V |
(c) 1.2 V |
(d) 2.4 V |
Identify the paramagnetic substance
|
(a) Iron |
(b) Aluminium |
(c) Nickel |
(d) Hydrogen |
Some radioactive nucleus may emit
|
(a) Only one α,β or γ at a time |
|
(b) All the three α,β and γ one after another |
|
(c) All the three α,β and γ simultaneously |
|
(d) Only α and β simultaneously |