Explore topic-wise InterviewSolutions in Current Affairs.

Which one of the following is/are true in the formation of emulsion?

i) the liquid in larger proportion act as dispersion of medium

ii) the liquid with higher surface tension forms the dispersion medium

iii) the liquid in which the emulsifying agent is more soluble forms the dispersion medium

iv) an emulsion is formed by vigorous shaking of two immiscible liquids

Consider the following statements and choose the correct option.

1. Magnetic field lines around a magnet cannot intersect.

2. When magnetic field lines intersect, the compass at the point of intersection flutuates between the two directions.

Choose the correct option.

The angular momentum of a flywheel having a moment of inertia of $0.4{\text{kg-m}}^2$ decreases from $30$ to $20{\text{kg-m}}^2/s$ in a period of $2\text{seconds}$. The average torque acting on the flywheel during this period is :

a convex lens of focal length 15 cm forms an image at 10 cm from the lens how far the object is placed from lens and draw a ray diagram. find the power of lens

What is the near point of healthy vision?

According to New Cartesian Sign Convention : (a) focal length of concave mirror is positive and that of convex mirror is negative (b) focal length of both concave and convex mirrors is positive (c) focal length of both concave and convex mirrors is negative (d) focal length of concave mirror is negative and that of convex mirror is positive

A thin convergent glass lens $({\mu }_g=1.5)$ has a power of $+5.0\text{D}$. When this lens is immersed in a liquid of refractive index ${\mu }_l$, it acts as a divergent lens of focal length $100\text{cm}$. The value of ${\mu }_l$ is

An object 50 cm tall is placed on the principal axis of a convex lens. Its 20 cm tall image is formed on the screen placed at a distance of 10 cm from the lens. Calculate the focal length of the lens.

In two experiments with a continuous flow calorimeter to determine the specific heat capacity of a liquid, an input power of $60$ W produced a rise of $10$ K in the liquid. When the power was doubled, the same temperature rise was achieved by making the rate of flow of liquid three times faster. The power lost to the surrounding in each case was :

Why ray passing through optic center go without deflection in a lense

The gravitational field due to a mass distribution is E = $\frac{A}{x^2}$ in x-direction. Here, A is a constant. Taking the gravitational potential to be zero at infinity, potential at x is

In which of the gases given below, the average speed of the molecule is the least at 1000K?

'The potential difference between two conductors is 1 volt. Explain the meaning of this statement.

1. 20

1. 16.08

A circular shaft of diameter 120mm is welded to a rigid plate by a fillet weld of size 6mm. If a torque of 8 kN-m is applied to the shaft, then the maximum stress induced in the weld is

If the binding energy of deuterium is 2.23 MeV, then the mass defect (in amu) is?

What is Polarity?

The magnetic field at a point inside a solenoid is $3\sqrt{2}\pi \times {10}^{-4}\text{T}$, and the line joining the point and one of the ends makes ${45}^{\circ }$. For a current of $2\text{A}$ and $750$ turns per unit length, calculate the angle made at the other end by the same point.

The nature of the image of a candle flame located 40cm from a concave mirror is real, inverted and magnified four times. The radius of curvature of the mirror will be

The equivalent resistance between the points A & B in the circuit is:

There are two important fuels A and B both of which are extracted from deep inside the earth. Fuel A is a thick, dark, foul-smelling liquid whereas fuel B is a black solid. Combustion of both the fuels produces products, C, D, E and F. The product C makes the rainwater only slightly acidic but it is mainly responsible for causing global warming. The product D is neither acidic nor basic. It is harmless and does not affect the environment in any way. Both E and F attack breathing system of humans and are mainly responsible for causing acid rain. In addition to combustion of fuels A and B, the product F is also formed when lightning occurs in the sky.
(a) What are (i) fuel A, and (ii) fuel B?
(b) Name (i) C (ii) D (iii) E, and (iv) F
(c) What is the process of formation of F during lightening known as?
(d) Which fuel is supposed to be exhausted sooner: A or B?
(e) Which fuel is mostly used for generating electricity at thermal power plants?

The turn ratio of a transformer is given as $2:3$. If the current through the primary coil is $3A$, then calculate the current through load resistance.

Two planets $\text{A}$ and $\text{B}$ travel counterclockwise in circular orbits around a fixed star. The radii of their orbits are in the ratio $1:4$. At some time, they are aligned as shown in the figure, making a straight line with the star. After a certain time, the planet $\text{A}$ comes back to its initial position, completing one full circle about the star. In the same time, angular displacement of the planet $\text{B}$ is

An object 20 cm from a convex mirror gives rise to a virtual image 15 cm behind the mirror. The focal length of the mirror is

Approximately for how many years will coal last if we maintain the current rate of consumption?

Which of the following will balance the second balance in equilibrium?