- AResistance
- ✓Potential differs
- CCurrent
- DNone of these
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
The activity of a radioactive sample is measured as 9750 counts per minute at t = 0 and as 975 counts per minute at t = 5 minutes. The decay constant is approximately
|
(a) 0.230 per minute |
(b) 0.461 per minute |
|
(c) 0.691 per minute |
(d) 0.922 per minute |
A hollow double concave lens is made of very thin transparent material. It can be filled with air or either of two liquids L1 and L2 having refractive indices n1 and n2 respectively (n2 > n1 > 1). The lens will diverge a parallel beam of light if it is filled with
|
(a) Air and placed in air |
(b) Air and immersed in L1 |
|
(c) L1 and immersed in L2 |
(d) L2 and immersed in L1 |
To deposit one gm equivalent of an element at an electrode, the quantity of electricity needed is
|
(a) One ampere |
(b) 96000 amperes |
(c) 96500 farads |
(d) 96500 coulombs |
The combination of gates shown below produces
| (a) AND gate | (b) XOR gate | (c) NOR gate | (d) NAND gate |
A particle of charge +q and mass m moving under the influence of a uniform electric field
and a uniform magnetic field
follows trajectory from P to Q as shown in figure. The velocities at P and Q are v
and -2v
respectively. Which of the following statement(s) is/are correct

|
(a) E = |
|
(b) Rate of work done by electric field at P is |
|
(c) Rate of work done by both the fields at Q is zero |
|
(d) a, b, c |
A truth table is given below. Which of the following has this type of truth table
|
A |
0 |
1 |
0 |
1 |
|
B |
0 |
0 |
1 |
1 |
|
y |
1 |
0 |
0 |
0 |
|
(a) XOR gate |
(b) NOR gate |
(c) AND gate |
(d) OR gate |
The similarity between the sound waves and light waves is
|
(a) Both are electromagnetic waves |
|
(b) Both are longitudinal waves |
|
(c) Both have the same speed in a medium |
|
(d) They can produce interference |