A galvanometer has a coil of resistance $$200\Omega$$ with a full scale deflection at $$20\mu \mathrm{A}$$. The value of resistance to be added to use it as an ammeter of range $$(0-20)\mathrm{mA}$$ is :

The equivalent resistance between A and B is :

To measure the internal resistance of a battery, potentiometer is used. For $$R=10\Omega$$, the balance point is observed at $$l=500\mathrm{cm}$$ and for $$\mathrm{R}=1\Omega$$ the balance point is observed at $$l=400\mathrm{cm}$$. The internal resistance of the battery is approximately :

An electric bulb rated $$50\mathrm{W}-200\mathrm{V}$$ is connected across a $$100\mathrm{V}$$ supply. The power dissipation of the bulb is:

Water boils in an electric kettle in 20 minutes after being switched on. Using the same main supply, the length of the heating element should be _________ to __________ times of its initial length if the water is to be boiled in 15 minutes.

In the given circuit, the terminal potential difference of the cell is :

In the given figure $${\mathrm{R}}_1=10\Omega ,{\mathrm{R}}_2=8\Omega ,{\mathrm{R}}_3=4\Omega$$ and $${\mathrm{R}}_4=8\Omega$$. Battery is ideal with emf $$12\mathrm{V}$$. Equivalent resistant of the circuit and current supplied by battery are respectively :

The ratio of heat dissipated per second through the resistance $$5\Omega$$ and $$10\Omega$$ in the circuit given below is:

A galvanometer of resistance $$100\Omega$$ when connected in series with $$400\Omega$$ measures a voltage of upto $$10\mathrm{V}$$. The value of resistance required to convert the galvanometer into ammeter to read upto $$10\mathrm{A}$$ is $$x\times 10^{-2}\Omega$$. The value of $$x$$ is :

The number of electrons flowing per second in the filament of a $$110\mathrm{W}$$ bulb operating at $$220\mathrm{V}$$ is : (Given $$\mathrm{e}=1.6\times 10^{-19}\mathrm{C}$$)

The value of unknown resistance $$(x)$$ for which the potential difference between $$B$$ and $$D$$ will be zero in the arrangement shown, is :

Two bodies of mass $$4\mathrm{g}$$ and $$25\mathrm{g}$$ are moving with equal kinetic energies. The ratio of magnitude of their linear momentum is :

A body of mass $$1000\mathrm{kg}$$ is moving horizontally with a velocity $$6\mathrm{m}/\mathrm{s}$$. If $$200\mathrm{kg}$$ extra mass is added, the final velocity (in $$\mathrm{m}/\mathrm{s}$$) is:

An artillery piece of mass $$M_1$$ fires a shell of mass $$M_2$$ horizontally. Instantaneously after the firing, the ratio of kinetic energy of the artillery and that of the shell is:

A spherical body of mass $$100\mathrm{g}$$ is dropped from a height of $$10\mathrm{m}$$ from the ground. After hitting the ground, the body rebounds to a height of $$5\mathrm{m}$$. The impulse of force imparted by the ground to the body is given by : (given, $$\mathrm{g}=9.8\mathrm{m}/{\mathrm{s}}^2$$)

A stationary particle breaks into two parts of masses $$m_A$$ and $$m_B$$ which move with velocities $$v_A$$ and $$v_B$$ respectively. The ratio of their kinetic energies $$\left(K_B:K_A\right)$$ is :

A big drop is formed by coalescing 1000 small droplets of water. The surface energy will become :

With rise in temperature, the Young's modulus of elasticity :

Given below are two statements : Statement (I) :Viscosity of gases is greater than that of liquids. Statement (II) : Surface tension of a liquid decreases due to the presence of insoluble impurities. In the light of the above statements, choose the most appropriate answer from the options given below :

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : The property of body, by virtue of which it tends to regain its original shape when the external force is removed, is Elasticity. Reason (R) : The restoring force depends upon the bonded inter atomic and inter molecular force of solid. In the light of the above statements, choose the correct answer from the options given below :