Explore topic-wise InterviewSolutions in Current Affairs.

Look at the figure given below and answer the question based on that. Iron filings are sprinkled on a cardboard perpendicular to which a current carrying copper wire runs. The other components of the circuit have their usual meanings. What happens to a compass at a particular point near the copper wire if the resistance of the circuit is increased?

The resistance of a platinum resistance thermometer of ice point, the steam point and the boiling point of sulphur are 2.50, 3.50 and 6.50$\Omega$ respectively. Find the boiling point of sulphur on the platinum scale. The ice point and steam point measure $0^{\circ }$ and ${100}^{\circ }$ respectively.

For the circuit shown below the student would observe

Work function for following metals given in the table.

Metal Work Function ${\varphi }_0\left(\text{eV}\right)$

$1$ $\text{K}$ $2.30$

$2$ $\text{Na}$ $2.75$

$3$ $\text{Mo}$ $4.17$

$4$ $\text{Ag}$ $4.7$

Their threshold wavelength in decreasing order must be

Determine the power of the resulting half lens if equi-convex lens of focal length $20\text{cm}$ is cut into $2$ equal half about line parallel to principal axis & line perpendicular to principal axis

The specific heat of a metal at low temperature varies according to $s=\alpha T^3$, where $\alpha$ is a constant and $T$ is absolute temperature. The heat energy needed to raise the temperature of unit mass of the metal from $T=1\text{K}$ to $T=2\text{K}$ is

Two free parallel straight wires carrying current in opposite direction

A.attract each other

B. do not affect Each Other

C.repel each other

D. get rotated to the perpendicular to the each other

When the potentials of two ends of a wire differ by 10 volts, the current flowing between the two ends is recorded as 2mA. What is the resistance offered by the wire?

In the frame shown below, force in the member AB will be

If a heater of resistance $100\Omega$ draws a current of $5A$ for $1hour$, then the energy consumed by the heater is:

Why a voltmeter is said to be ideal when it has infinite resistance?

A ray of monochromatic light follows the path shown in the figure as it passes through five layers of different optical media of refractive indices ${\mu }_0,{\mu }_1,{\mu }_2,{\mu }_3\text{and}{\mu }_4$. If the angle of incidence in the first medium is ${30}^{\circ }$, determine the angle of deviation on the whole.

The angle of incidence for a ray of light at a refracting surface of a prism is ${45}^{\circ }.$ The angle of prism is ${60}^{\circ }.$ If the ray suffers minimum deviation through the prism, the angle of minimum deviation and refractive index of the material of the prism, respectively are



[Assume the surrounding medium to be air]

The driving wheel of a gear system is of radius 1 cm and it has 8 teeth. For twelve rotations of the driving wheel, the driven wheel makes one rotation. Find the radius of the driven wheel.

If ${10}^{20}$ electrons flow from the black body to the red body through the copper wire in 8 seconds, then find the current flowing between them.

Which of the following relations hold good for 'R' and 'F', where 'R' is the radius of curvature of a spherical mirror and 'F' is the focal length of the mirror?

In a hydro power plant:

How is the working of an electric bell affected, if alternating current be used instead of direct current?

A 1 cm high object is placed at a distance of 2f from a convex lens. What is the height of the image formed ?

The appliances in our homes are connected in

State the kind of mirror used

(a) by a dentist,

(b) as a search-light reflector.

Question 5

A person needs a lens of power -5.5 dioptres for correcting his distant vision. For correcting his near vision he needs a lens of power +1.5 dioptre. What is the focal length of the lens required for correcting (i) distant vision and (ii) near vision?

For a circuit having equivalent resistance, $R=5\text{M}\Omega$ and capacitance $C=2\mu \text{F}$, what time will be elapsed before the power delivered by the battery drops to $25\%$ of its maximum value?

1. gas outlet 2. manure 3. Slurry 4. digester.

The radiation exposure is measured by the unit called __.