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The moment of a force about a given axis depends

An electric refrigerator rated 500 W operates 10 hr per day. What is the cost of the energy to operate it for 30 days at Rs. 4.00 per kWh?

What is short circuiting? What is overloading? How can you avoid overloading? [3 MARKS]

The efficiency of the solar cooker can be increased by placing a ______.

In an alpha decay, the atomic number of an element decreases by ___

A convex lens of power 5D is placed at a distance of 30 cm from a screen. At what distance from the lens should the screen be placed so that its image is formed on the screen? [3 MARKS]

When light enters from medium P to medium Q, it is given that the value of $\frac{\text{sin i}}{\text{sin r}}$ is less than 1 which means:

Find the critical angle for a ray of light travelling from glass to air?

[ ${\mu }_g$ = $\sqrt{2}$ , ${\mu }_a$ = 1 ]

A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is $R^{{}^{\prime }}$, then the ratio $\frac{R}{R^{{}^{\prime }}}$ is:

In an experiment to trace the path of a ray of light through a glass prism for different values of angle of incidence a student would find that the emergent ray:

Which of the following pairs of angle will be equal in the given figure. Given $\angle 2={30}^{\circ }$

According to Kepler's Third Law:

Two plane mirrors are at an angle θ to each other. Light incident on one mirror after reflection from the other mirror returns parallel to the original direction. The angle θ must be

More the resistance of the conductor, ___.

In a discharge lamp, if colour of the light is green, then which gas does the lamp contains?

The absolute zero is the temperature at which :

The gravitational force between two stones of mass 1 kg each separated by a distance of 1 metre in vacuum is

(a) Arrange the following radiations in the order of their increasing wavelength :

X rays, infrared rays, radio waves, gamma rays, and microwaves.

(b) Name the radiation which is used for satellite communication.

The temperature of the surroundings start falling when the ice of a frozen lake starts melting

In the figure given below, a coil is placed between two permanent magnets and rotated with the help of an axle on which two rings R1 and R2 are internally attached. B1 and B2 represent metallic brushes. G represents a galvanometer.

As the coil starts to rotate, the current flows through ABCD as shown. The coil starts rotation in the?

Four resistances 2.0 Ω of each are joined end to end to form a square ABCD. The equivalent resistance of the combination between two adjacent corners is:

What is meant by resonance? Describe a simple experiment to illustrate the phenomenon of resonance and explain it.

Match the following and choose the correct option from below:

Units of energy other than its S.I units & its multiples are:

SI units of current is:

A mango is falling from the branch of a tree at a height h from the ground. After it has fallen a height of $\frac{h}{2}$, it will possess:

One of the following does not contribute to acid rain. That is :
(a) nitrogen monoxide (b) sulphur dioxide
(c) carbon monoxide (d) carbon dioxide

Find $\frac{v_e}{v_o}$ where
$v_e:$ Escape velocity of satellite at the surface of earth.
$v_o:$ Orbital velocity of satellite orbiting at the surface of earth.

Which among the following expands on melting?

An object 4 cm tall is placed in front of a convex lens. It produces an image 3 cm tall. What is the magnification of the lens?

Changing a current in a coil produces EMF in the same coil. This phenomenon is known as

In an electrical circuit two resistors of 2 $\Omega$ and 4 $\Omega$ respectively are connected in series to a 6 V battery. The heat dissipated by the 4 $\Omega$ resistor in 5 s will be:

An object of mass 1 kg was moving at a speed of 10 m/s. Constant force acts for 4 s on the object and the speed of object was 2 m/s in opposite direction after the applied force was removed. Identify the correct statements.

State one difference between a musical note and a noise.

Identify the condition, which will form a real, inverted and diminished image.

Name the material which is used for making the heating element of an electric iron.

What coloured light is used in danger signals?

Why is potential difference across a component also defined as the negative of the work done by the electric forces on a unit charge which passes through the component?

A tuning fork is vibrating in air. State whether the vibrations are natural or damped ?

What is direction of current?

How and why metals act as a good conductors of electricity ?

A convex mirror used on automobile has 3 m radius of curvature. If a bus is located at 5m from this mirror, find the position and size of the image

What is a charge? What is charging?

Does plasma has any refractive index ???

If 10²⁰ electrons flow from the black body to the Gray body through a copper wire in 8 seconds, what is the amount of current flowing in the copper wire in that time interval ?

How do field lines of regions of strong field different from those of weak field

The most common method of defrosting frozen meat/fish is by pouring water on them or holding them under the sink tap. This definitely is a direct application of the fact that if you pour water on ice it melts.

Is it possible to freeze water by dropping ice on it. Give logical explanation of your answer