Explore topic-wise InterviewSolutions in Current Affairs.

The magnetic field lines in the middle of the current-carrying solenoid are :

(a) circular

(b) spirals

(c) parallel to the axis of the tube

(d) perpendicular to the axis of the tube

Locate the centre of gravity for the following rectangle.

Find the angle of refraction in the following figure?

An effort of 240 N overcome a useful load 1000 N when applied to a block and system of pulleys, such that the weight movable block and friction is 200 N.
Calculate the efficiency of the system (to the nearest integer).

What should be the position of object when a concave mirror is used as shaving mirror.

A wire of resistance 20 Ohm is bent to form a closed square . What is the resistance across a diagonal of the square?

The volume of colloidal particle $V_c$ as comapred to the volume of solute particle in a true solution $V_s$ could be

Q7. Consider the following statements about Magnesium diboride:

1. Indian scientists have developed world’s thinnest material with this material.

2. Indian scientists have developed world’s thinnest material with this material.

Which of the above statements are correct?

(a) In which direction does conventional current flow around a circuit?
(b) In which direction do electrons flow?

A concave mirror cannot be used as : (a) a magnifying mirror (b) a torch reflector (c) a dentist's mirror (d) a rear view mirror

Complete the following:
(a) $1kWh=\frac{1volt\times 1ampere\times \cdots }{1000}$
(b) $1kWh=\cdots j$

A wire of length L and resistance R is stretched so that its length its doubled. How will

(i) Resistance change (ii) Resistivity change?

A light ray is incident on a plane mirror and the angle of reflection is ${50}^{\circ }$. Calculate the angle between the incident ray and the reflected ray.

Raj is standing in front of a plane mirror. The distance between Raj and his image is 100cm. If the distance between the mirror and image is x. What could be the possible value of x?

State two ways of increasing the frequency of vibrations of a stretched string.

Question 4
A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a cross-section of the filament in 16 seconds would be roughly

(a) ${10}^{20}$
(b) ${10}^{16}$
(c) ${10}^{18}$
(d) ${10}^{23}$​​​​​​​

A beam of light is traveling from Region I to Region IV (refer figure). The refractive index of Region I, II, III and IV are $n_0,\frac{n_0}{2},\frac{n_0}{6}and\frac{n_0}{8}$ respectively. The angle of incidence $\theta$ for which the beam just misses entering Region IV is:

__ electrons pass through a lamp in one minute if the current is 200 mA.

The statement that is not true for the long form of the periodic table is?

A substance of mass m kg requires a power input of P watts to remain in the molten state at its melting point. When the power is turned off, the sample completely solidifies in time t sec. What is the latent heat of fusion of the substance

Why do we use lenses of very thin aperture?

The probability of electrons to be found in the conduction band of an intrinsic semiconductor at a finite temperature

Circuit Breaket Device which can be used in place of fuse in domestic electric wiring in called :

(a) CBD (b) DCD (c) MCD (d) MCB

What is the effect of the size of the mirror on the nature of the image?

The charge on sol is due to the adsorbed

[MP PMT 1985]

A 1 cm high object is placed at a distance of 32 cm from a concave mirror. The image is real, inverted and 1.5 cm in size. Calculate the focal length of the mirror and the position of the image. [3 MARKS]

Magnetic field lines never intersect each other because

State whether the moment of force is a scalar or vector quantity ?

When you see your image in a plane mirror, is it exactly you? Suppose you are looking into a mirror. Your left hand will appear to be at ________in its image in the mirror.

In the video the teacher said that the clouds are white as the contain droplets of water and refract all colours equally. Shouldn’t a rainbow also be white as it is formed by splitting of white light by water droplets

Thangs and regards

Which position of the coil in the magnetic field gives maximum emf?

The amount of charge in coulombs passing through electrolytic cell in the electrolysis of aq. CuSO₄ solution, if 0.3177 grams of copper was deposited at the cathode, is (at wt. of Cu = 63.54)

Give two characteristics of the virtual image formed by a convex lens.

Match the contents of column (I) with contents of the column (II).

Sir/madam,

When we talk about refraction we say that light wants to take the quickest path to reach a point and therefore it bends accordingly while entering in a different medium; but light does not wants to reach any particular point, it just wants to travel forever:how do we justify this?

In domestic circuits, the appliances are generally connected in ___ .

What would be the change in the speed of wave if tension in wire is increased nine times?

A freely suspended copper conductor carrying current is held between the pole pieces of a magnet, as shown in the diagram. The arrow on the conductor indicates the direction of flow of current. state the direction of movement of the conductor.

Which has higher refractive index : water or glass ?

Which characteristic of the conductor does not affect its resistance?

What is the standard voltage for households in India?

An irregular crystal structure reflects all the light that falls on it’s as shown in the diagram.

Which of the following statements is/are true?

Far point of a normal eye is situated at:

A uniform rod 2 m long has weights of 5 gf and 30 gf at its ends. If it balances 50cm from one end, what is the weight of the rod?

One of the following is not required in the formation of biogas in a biogas plant. This is :
(a) cow-dung (b) water (c) oxygen (d) anaerobic bacteria