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A rod is lying still on a table which is also at rest as observed from ground's frame of reference. The net torque on the rod is zero with respect to?

Statement 1: The turbine is used for generating electricity in thermal power plant, hydro power plant and geothermal power plant.

Statement 2: Because turbine converts one form of energy to mechanical energy which further produces electric energy.

The magnetic field associated with a current carrying straight conductor is in anticlockwise direction. If the conductor was held along east - west direction what will be the direction of current through it ? Also state the rule which is used to find the direction of current in this case

When the speed of a satellite near the surface of the earth is increased by $x\%$, it will escape from its orbit, the value of $x$ is:

List the properties of magnetic lines of force. [3 MARKS]

An air conditioner rating 2000w;220v is operated a domestic circuit of rrow that has different rating of 5A. What result do you expect?

If the mass of the electron is $9.1\times {10}^{-31}\text{kg}$ and Charge its charge is $1.6\times {10}^{-19}\text{C}$ , then the intensity of the electric field required to balance the weight of an electron is

Water is used in hot water bottles for fomentation.Give a reason.

A box follows a zigzag path to reach point B from point A. The actual length of the path is 5 m and the length of the straight line joining the two points is 2 m. If a force of 5 N acts on the box in the direction of displacement, then the work done on the box by the force is:

1. 344.43

The the system in the figure is in equilibrium. The value of PR in terms of RQ is equal to

An object of mass $5\text{kg}$ is moved from infinity to a point $\text{A}$. Initially the object was at rest but on reaching $\text{A}$ , its speed becomes $5\text{m/s}$. If the work done in moving that object is $-25\text{J}$, then find the ratio of potential energy to mass at point $\text{A}$ (in $\text{J/kg}$) is

Calculate the breakdown voltage of series combination of two capacitors having capacitance $2\mu \text{F}$ and $6\mu \text{F}$ as shown in the figure.

A beam of protons with speed $4\times {10}^5$${\text{ms}}^{–1}$ enters a uniform magnetic field of $0.3\text{T}$ at an angle of ${60}^{\circ }$ to the magnetic field. The pitch of the resulting helical path of protons is close to :

$(\text{Mass of the proton}=1.67\times {10}^{–27}\text{kg},\text{charge of the proton}=1.6\times {10}^{–19}\text{C})$

Give the factors that affect strength of magnetic field at a point due to a straight conductor carrying current. [3 MARKS]

The reaction force exerted by the table on $100g$ book which is kept stationary on table is .($g=10m{s}^{-2}$)

The energy released when $10\text{mg}$ of mass is converted into energy

Focal lenghts of two lenses are $10\text{cm}$ and $-20\text{cm}$ and dispersive powers of their materials are $0.03$ and $\omega$ respectively. To form a chromatic combination from these, the value of $\omega$ is

Calculate the electricity bill amount for a month of $30$ days, if the following devices are used as specified :



$\left(i\right)$. $2$ Bulbs of $40\text{W}$ for $6\text{h/day}$



$\left(ii\right)$. $2$ Tube lights of $50\text{W}$ for $8\text{h/day}$



$\left(iii\right)$. $1$ TV of $120\text{W}$ for $6\text{h/day}$



Given, the cost of electricity is $\text{Rs.}2.5/\text{unit}$.

Electric motor is a device which converts

During the natural disaster (Tsunami) at Japan, the nuclear reactors were damaged, due to which hazardous radiation affected the large area?

i. What will be the reason for this damage?

ii. How it affected the people and environment?

iii. Do you think that nuclear energy is good for nature?

A body of mass 10 kg is moving with velocity 4 $m{s}^{-1}$. The kinetic energy and momentum of the body is:

After being dispersed by a prism, a white light splits into seven colours. Which colour will be refracted the most?

Select the uniform usually worn by sanitation workers.