Explore topic-wise InterviewSolutions in Current Affairs.

In the process of light entering our eye and forming an image at retina, at which interface the maximum refraction takes place?

A proton of mass $1.6\times {10}^{-27}\text{kg}$ and charge $1.6\times {10}^{-19}\text{C}$ is shot perpendicular to a uniform magnetic field with a velocity $5\times {10}^6\text{m/s}.$ If the magnetic field is $1\text{T}$. The frequency of revolution is

A pendulum clock keeps correct time at $0^{\circ }$. Its mean coefficient of linear expansions is $\alpha {/}^{\circ }$, then the loss in seconds per day by the clock if the temperature rises by $t^{\circ }$ is

A closed coil consists of $500$ turns on a rectangular frame of area $4.0{\text{cm}}^2$ and has a resistance of $50\Omega$. The coil is kept with its plane perpendicular to a uniform magnetic field of $0.2{\text{wb/m}}^2$, the amount of charge flowing through the coil if it is turned over (rotated through ${180}^{\circ })$

Question 1

What are the different ways in which water gets contaminated?

How to determine whether an electric charge is positive or negative ?

1 watt of electric power is equivalent to ___.

(a) Draw a labelled diagram to show the domestic electric wiring from an electric pole to a room. Give the wiring for a bulb and a three-pin socket only.

(b) State two hazards associated with the use of electricity.

(c) State the important precautions which should be observed in the use of electricity.

(d) What will you do if you see a person coming in contant with a live wire ?

(e) Explain why, electric switches should not be operated with wet hands.

The smaller the focus of a convex lens more will be its magnifying capacity, so why don't we use magnifying glasses with very small focal length?

If a bar magnet was cut initially into two pieces. Then each of the new pieces was cut into two more pieces, and the process was repeated one more time, find out the number of the north pole generated?

Out of convex mirror and concave mirror, whose focus is situated behind the mirror ?

The self-inductance of a coil having 400 turns is 10 mH. The magnetic flux through the cross-section of the coil corresponding to current 2 mA is

(a) 4 x ${10}^{-3}$ Wb

(b) 3 x ${10}^{-3}$ Wb

(c)2 x ${10}^{-3}$ Wb

(d) 8 x ${10}^{-3}$ Wb

1. 175.4

A monochromatic light of wavelength $560\text{nm}$ is incident on a single slit and a diffraction pattern is formed. Now the whole set up is placed in liquid of refractive index $1.5$ and when in this case a light of wavelength $\lambda$ is used the third maxima coincides with $2^{nd}$ minimum of previous case. The wavelength $\lambda$ of light is

Which of the following is false regarding Chandrayaan?

Two junction diodes one of germanium $\left(\text{Ge}\right)$ and other of silicon $\left(\text{Si}\right)$ are connected to a battery of emf $12\text{V}$ and a load resistance $10\text{k}\Omega$ as shown in the figure. The germanium diode conducts at $0.3\text{V}$ and silicon diode at $0.7\text{V}.$ When a current flows in the circuit, the potential of terminal $\text{Y}$ will be

A person looks at different trees in an open space with the following details. Arrange the trees in decreasing order of their apparent sizes.



$\begin{array}{ccc}\text{Tree}& \text{Height(m)}& \text{Distance from the eye(m)}\\ \text{A}& 2.0& 50\\ \text{B}& 2.5& 80\\ \text{C}& 1.8& 70\\ \text{D}& 2.8& 100\end{array}$

(a) State and explain joule's law of heating.
(b) A resistance of 40 ohms and one of 60 ohms are arranged in series across 220 volts find heat in joules produced by this combination of resistance in half a minute.

1. 12

A lens forms an upright and magnified image of an object.

(a) Name the lens.

(b) Draw a labelled ray diagram to show the image formation.

A convex lens of focal length $f$ produces a real image $\frac{1}{n}$ times of the size of the object. The distance of the object from the lens is

Which of the following is not classified under a fossil fuel?

1. 55.6

If lens A has focal length $+15cm$ and lens B has focal length $+30cm$, find out which lens has more power?

An optical fibre consists of a core having refractive index ${\mu }_1$ surrounded by a cladding of refractive index ${\mu }_2$ $({\mu }_2<{\mu }_1)$. A beam of light enters from the air at an angle of $\alpha$ with the axis of the fibre. The highest value of $\alpha$ for which ray can be travelled through fiber is

Pick out the statement which is not true

Q41. With reference to the International Watercourse Convention, consider the following statements

1. It is an international treaty adopted by International Maritime adopted by United Nations.

2. It covers both surface water and groundwater.

3. India has recently ratified the agreement.

Select the correct code.