Question Bank Directory

Two very long, straight, parallel conductors A and B carry current of 5 A and 10 A respectively and are at a distance of 10 cm from each other. The direction of the current in the two conductors is the same. The force acting per unit length between two conductors is: ($\mu_0=4\pi \times 10^{-7}$ SI unit)

The magnetic field on the axis of a circular loop of radius 100 cm carrying current I = √2 A, at a point 1 m away from the centre of the loop is given by:

A very long conducting wire is bent in a semi-circular shape from A to B as shown in the figure. The magnetic field at the point P for steady current configuration is given by:

Which of the following is not an inhibitory substance governing seed dormancy?

In forward biasing of the p-n junction:

Identify the equivalent logic gate represented by the circuit given below:

In the nuclear decay given below: $$ _{Z}^{A}X \rightarrow _{Z+1}^{A}Y \rightarrow _{Z-1}^{A-4}B^* \rightarrow _{Z-1}^{A-4}B $$ The particles emitted in the sequence are:

Which of the following statements is true for nuclear forces?

Two nuclei have their mass numbers in the ratio of 1:3. The ratio of their nuclear densities would be:

The rate of radioactive disintegration at an instant for a radioactive sample of half-life $2.2 \times 10^9 \text{ s}$ is $10^{10} \text{ s}^{-1}$. The number of radioactive atoms in that sample at that instant is:

What is the radius of iodine atom? (atomic no. 53, mass no. 126)

What happens to the mass number and the atomic number of an element when it emits $\gamma$-radiation?

If a nucleus $_n X^m$ emits one $\alpha$ and two $\beta$ particles, the resulting nucleus will be:

A human body required the $0.01\text{ Curie}$ activity of a radioactive substance after $24\text{ hours}$. The half-life of the radioactive substance is $6\text{ hours}$. The maximum activity of the radioactive substance that can be injected will be:

The binding energy per nucleon of ${}_{3}^{7}Li$ and ${}_{2}^{4}He$ nuclei are $5.60 \text{ MeV}$ and $7.06 \text{ MeV}$, respectively. In the nuclear reaction ${}_{3}^{7}Li + {}_{1}^{1}H \rightarrow {}_{2}^{4}He + {}_{2}^{4}He + Q$, the value of energy Q released is:

The power obtained in a reactor using U-235 disintegration is 1000 kW. The mass decay of U-235 per hour is:

Fusion reaction takes place at high temperature because:

The numbers of nuclei of a radioactive substance at time t = 0 are 1000 and 900 at time t = 2 sec. Then the number of nuclei at time t = 4 sec will be:

If the nuclear radius of ${}^{27}\mathrm{Al}$ is 3.6 Fermi, the approximate nuclear radius of ${}^{64}\mathrm{Cu}$ in Fermi is:

For a chemical reaction, $4A + 3B \rightarrow 6C + 9D$ rate of formation of C is $6 \times 10^{–2} \text{ mol L}^{–1} \text{ s}^{–1}$ and rate of disappearance of A is $4 \times 10^{–2} \text{ mol L}^{–1} \text{ s}^{–1}$. The rate of reaction and amount of B consumed in interval of 10 seconds, respectively will be: