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For a straight current-carrying wire, the magnetic field lines are ___.

Three resistances $R,2R$ and $3R$ of same material and same length have their area of cross-section in the ratio

A mass 'm' placed on a frictionless horizontal table and attached to a string passing through a small hole in the surface. Initially, the mass moves in a circle of radius $r_0$ with a speed $v_0$ and the free end of the string, is held by a person. The person pulls on the string slowly to decrease the radius of the circle to 'r'. Find the tension in the string when the mass moves along the circle?

The disatnce between an object and a screen is $100\text{cm}$. A lens produces an image on the screen when placed at either of the two positions $40\text{cm}$ apart. The power of the lens is nearly

Which of the following statement regarding combustion of fuel is not true?

A 4 kg projectile is launched from a height of 2 m with an initial speed of 12 m/s. Find its speed when it is at a maximum height of 3 m above the ground.

A satellite of mass 1000 kg is suposed to orbit the earth at a height of 2000 km above the earth 's surface. Find (a) its speed in the orbit, (b) its kinetic energy, (c) the potential energy of the earth - satellite system and (d) its time period. Mass of the earth $=6\times {10}^{24}$ kg.

1. 304.51

__ occurs when the vapour pressure of the salt is much lower as compared to the atmospheric vapour pressure.

Two identical cylindrical vessels, each of base area A, have their bases at the same horizontal level. They contain a liquid of density $\rho$. In one vessel, the height of the liquid is $h_1$ and in the other $h_2>h_1$. When the two vessels are connected, the work done by gravity in equalizing the levels is

A bulb is rated as 270V, 0.5 A. Its power is

What difference will you see in the electric current if the magnet approaches the coil with greater speed?

A wire seems to have charges flowing through it. When a compass is kept next to it, the needle deflects. The reason for the deflection is:

Sun appears to be white and sky appears to be black in space because

The Boolean function F(X,Y) realized by the given circuit is

Which of the following graphs correctly represent the variation of magnetic field $\left(B\right)$ inside a finite length solenoid with respect to distance $x$ from its center. The current in solenoid having $n$ turns per unit length is $i$.

If $I_{m,n}=\int {\sin }^{m}x\cdot {\cos }^{n}xdx,$ then which of the following is/are equal to $I_{6,4}$

Complete the following sentence:

Angle of deviation is the angle which the .................ray makes with the direction of ................ray.

A potentiometer is connected across $A$ and $B$ and a balance is obtained at $64.0\text{cm}$. When the potentiometer is connected across $A$ and $C$, a balance is found at $8.0\text{cm}$. If the potentiometer is now connected across $B$ and $C$, a balance will be found at,

A $0.1\text{H}$ inductor is connected to a $220\text{V}$, $50\text{Hz}$ ac supply. The rms value of the current in the circuit is

Fuel used in thermal power plants is

A cell is used to send current to an external circuit.

(a) How does the voltage across its terminals compare with its e.m.f.?

(b) Under what condition is the e.m.f. of the cell equal to its terminal voltage?

1. 150

In a rapid sand filter, the time for reaching particle break through ($T_B$) is defined as the time elapsed from start of filter run to the time at which the turbidity of the effluent from the filter is greater than $2.5NTU$. The time for reaching terminal head loss $\left(T_H\right)$ is defined as the time elapsed from the start of the filter run to the time when head loss across the filter is greater than 3 m.

The effect of increasing the filter depth (while keeping all other conditions same) on $T_B$ and $T_H$ is

If the earth stops rotating, the value of 'g' at the equator will

Which of the following is not an eye defect?