List of top Physics Questions

A motor
At the mid point along the length of a long solenoid, the magnetic field is equal to x. If the length of the solenoid is doubled and the current is reduced to half, the field at the new mid point will be nearest to
$1000$ drops of water of radius $1\,cm$ each carrying a charge of $10\, esu$ combine to form a single drop. The capacitance of combined drop increases
Two parallel wires carry electric current in same direction. The wires
In India electricity is supplied for domestic use at $220\, V$. It is supplied at $110 \,V$ in USA. If the resistance of a $60 \,W$ bulb for use in India is $R$, the resistance of a $60 \,W$ bulb for use in USA will be
An example of a non ohmic device is
A particle starts with S.H.M. from the mean position as shown in the figure. Its amplitude is $A$ and its time period is $T$. At one time, its speed is half that of the maximum speed. What is this displacement?
Resistance of an ideal ammeter is
A red flower seen through a green glass looks
Four resistors of $100\,\Omega$ each are connected in the form of a square. Then the effective resistance along the diagonal point is
An electron in motion is associated with
There is no hole current in good conductors because:
A force vector applied on a mass is represented as $\overrightarrow{F}=6\widehat i-8\hat j+10\hat k$ and accelerates with $1 m/s^2.$ What will be the mass of the body?
The statement "algebraic sum of currents meeting at a node is zero" is
Sky seen from earth appears blue because of
When light passes form one medium to another, there is a change in
Figures below show four ways of making a regular hexagon out of wires of two different kinds P, Q with current beafls at the middle of opposite wires, the magnetic field at the centre of the hexagon is not zero in
Thermocouple thermometer is based on
A metallic solid sphere is placed in a uniform electric field. Which path, the lines of force follow as shown in figure?
A nucleus emits one $\alpha$-particle and forms a new nucleus. The mass and charge of the new nucleus is changed in one of the following way
The forces, which meet at one point but their lines of action do not lie in one plane, are called
The bulk modulus of a fluid is inversely proportional to:
A galvanometer of 25 ohms and having full scale deflection for a current of 10 mA is changed into voltmeter of range 100 volts by connecting a resistance R in series with the galvanometer. The resistance R in ohms is:
Which of the following types of wheels of same mass and radius will have largest moment of inertia?
The tension in piano wire is 10 kg. What should be the tension in the wire to produce a note of double the frequency?