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When 2 g of a gas is introduced into an evacuated flask kept at ${25}^{\circ }C$, the pressure is found to be 1 atmosphere. If 3 g of another gas B is then added to the same flask, the total pressure becomes 0.5 atmosphere. Assuming ideal gas behaviour, calculate the ratio of molecular mass $M_A:M_B$.

How many important methods of resource conservation are there at the individual local level?

(a) An object is placed 10 cm from a lens of focal length 5 cm. Draw the ray diagrams to show the formation of image if the lens is (i) converging, and (ii) diverging. (b) State one practical use each of convex mirror, concave mirror, convex lens and concave lens.

The refractive index of glass is $\frac{3}{2}$. Velocity of light in glass would be

For what position of an object a real, diminished image is formed by a convex lens ?

A current is passing through a resistor for a certain time. The current is doubled and the resistance halved while the time remains the same. What happens to the heating effect?

When the diameter of wire is doubled its resistance befcomes:
(a) Double (b) four times (c) one - half (d) one - fourth

The diagram given below shows a right-angled prism with a ray of light incident on the side AB. (The critical angle for glass is 42°). The path of the ray of the light ray out of the glass prism is such that the value of the angle of deviation shown by the ray is

What is the near and far point of a normal eye?

Which of the following statement is true regarding hydropower plants?

A motion that repeats itself after equal intervals of time is known as:

In the following chain reaction,

A $\to$ B $\to$ C, A and B are radioactive while C is stable. Initially we have only A and B type of nuclei. There is no nucleus of type C. As the time progresses, match the two columns

$\begin{array}{cc}\text{Column I}& \text{Column II}\\ \text{(A) Number of nuclei of (A +B)}& \text{(p) Will increase continuously}\\ \text{(B) Number of nuclei of (B)}& \text{(q) Will decrease continuously}\\ \text{(C) Number of nuclei of (C +B)}& \text{(r) Will first increase and then decrease}\\ \text{(D) Number of nuclei of (A +C)}& \text{(s) Data insufficient}\end{array}$

Which of the following has virtual focus?

A particle having mass $m$ is projected with a velocity $v_0$ from a point $P$ on a horizontal ground making an angle $\theta$ with horizontal. Find out the torque about the point of projection acting on the particle when it is at its maximum height?

Question 11
The power generated in a windmill

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

Which of the following statement is true?

List out a few applications of a microphone in our day-to-day life.

A concave lens has focal length 15 cm. At what distance should the object from the lens should be placed so that it forms an image at 10 cm from the lens? Also find the magnification produced by the lens.

In which radioactive disintegration, the neutron dissociates into proton and electron?

1. 14

When two mutually perpendicular simple harmonic motions of same frequency, amplitude and phase are superimposed

Name the spherical mirror which (i) diverges (ii) converges the beam of light incident on it. Justify your answer by drawing a ray diagram in each case.

The middle finger in Fleming’s right hand rule represents the direction of which quantity?

The main source of carbon monoxide in the atmosphere is:

The magnetic field inside the solenoid is :

When a concave mirror is used as a shaving mirror, where is the person’s face in relation to the focus of the mirror?

What is responsible for looming?

For an object, its good to have___.

Show by a diagram the refraction of two light rays incident parallel to the priniciple axis on a convex lens by treating it as a combination of a glass slab and two triangular glass prisms.

Give two reasons why the efficiency of a single movable pulley is not $100\%$.

If a wire of resistance $20\Omega$ is covered with ice and a voltage of 210 V is applied across the wire, What will be the rate of melting of ice? [Specific latent heat of fusion of ice = 80 cal/g]

Convert the temperature of $276K$ to the celsius scale.

Write a short note on sustainable management? Now explain what are bio diversity hotspots? [5 MARKS]

The figure shows the current flowing in the coil of wire wound around the soft iron horseshoe core. State the polarities developed at the ends A and B.

The units of magnetic flux density is ______.

The scientist who first carried out critical nuclear fission reaction is _____.

What is the nature of a lens having a power of + 0.5 D ?

Show how you would connect three resistors, each of resistance $6\Omega$, so that the
combination has a resistance of (i) $9\Omega$ (ii) $2\Omega$ [3 MARKS]