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Consider two statements A and B given below : A : real image is always inverted B : virtual image is always erect Out of these two statements : (a) only A is true (b) only B is true (c) both A and B are true (d) none is true

Find out the word common to the following pictures with respect to light.

1 Kg of ice at -20${}^{\circ }$C is mixed with 2 Kg of water at 90${}^{\circ }$C. Assuming that there is no loss of energy to the environment, what will be the final temperature of the mixture? (Assume latent heat of ice = 334.4 KJ/Kg, specific heat of water and ice are 4.18 kJ/(kg.K) and 2.09 kJ/(kg.K), respectively.)

A light wave is incident normally on a glass slab of refractive index $\mathrm{1.5.}$ If $4\%$ of light gets reflected and the amplitude of the electric field of the incident light is $30{\text{Vm}}^{-1}$ then the amplitude of the electric field for the wave propagating in the glass medium will be :

Two straight and long conductors AOB and COD are perpendicular to each other and carry currents of $I_{1}and{I}_2$. The magnitude of the magnetic field at a point P at a distance a from point 0 in a direction perpendicular to the plane ABCD is

A body of mass 2 kg has an initial velocity $v_i=(\hat{i}+\hat{j})m{s}^{-1}$. After collision with another body its velocity becomes $v_f=(5\hat{i}+6\hat{j}-\hat{k})m{s}^{-1}$. If the impact time is 0.02 s, the average force of impact on the body (in newton) is

If the radius of the earth is to be increased by a factor of $5$ then by what factor its density be changed to keep the value of $g$ the same ?

What is Potential Density at a point in an electric field?

Explain the sign convention of lens and mirrors.

In the figure shown, for an angle of incidence 45° at the top surface, what is the minimum refractive index needed for total internal reflection at vertical surface?

If an object of 10 cm height is placed at a distance of 36 cm from a concave mirror of focal length 12 cm, find the position, nature and height of the image.

Sound wave having a frequency greater than 20000 Hz is said to be

The advantages of using solar energy instead of fossil fuels is that it is______________________

A point charged $q=50\mu \text{C}$ is located in the $xy$ plane at the point of position vector $\overrightarrow{r_o}=2\hat{i}+3\hat{j}$. What is electric field at the point of position vector $\overrightarrow{r}=8\hat{i}-5\hat{j}$? (In S.I unit)

A light and a heavy object have the same momentum. Which one of the following statements is correct regarding the kinetic energy of these two objects?

A 2kw boiler used for 1h everyday consumes the electrical energy for the whole month of April. The number of units consumed will be.....

The phenomenon of electromagnetic induction is :

(a) the process of charging a body.

(b) the process of generating magnetic field due to a current passing throught a coil.

(c) producing induced current in a coil due to relative motion between a magnet and the coil.

(d) the process of rotating a coil of an electric motor.

Which among the following are major type of pollution?

A girl was playing with a beam of light from a laser torch by directing it from different directions on a convex lens held vertically. In a particular direction, the beam of light continued to move along the same direction after passing through the lens.

1. State the reason for this observation.
2. If the white light source is used with

a. parallel
b. non parallel sides, record your observations

A ray of light falls in a transparent sphere with centre at $C$ as shown in the figure.



The ray emerges from the sphere parallel to the line $AB$. The refractive index of the sphere is

In which of the following cases more electrical energy is consumed per hour ?

(i) A current of 1 ampere passed through a resistance of 300 ohms.

(ii) A current of 2 amperes passed through a resistance of 100 ohms.

A man cannot see objects closer than $1$ metre from the eye clearly. What is the power of the corrective lens he should use?