NEET (UG) entrance exam Question Bank Solutions for Physics

A tub of hot water cools from 80°C to 75°C in time t₁ from 75°C to 70°C in time t₂, and from 70°C to 65°C in time t₃ then:

Two circular discs A and B with equal radii are blackened. They are heated to the same temperature and are cooled under identical conditions. What inference do you draw from their cooling curves?

In a potentiometer circuit, a cell of EMF 1.5 V gives balance point at 36 cm length of wire. If another cell of EMF 2.5 V replaces the first cell, then at what length of the wire, the balance point occurs?

A cup of coffee cools from 90°C to 80°C in t minutes, when the room temperature is 20°C. The time taken for a similar cup of coffee to cool from 80°C to 60°C at a room temperature same at 20°C is ______

In a potentiometer circuit a cell of EMF 1.5 V gives balance point at 36 cm length of wire. If another cell of EMF 2.5 V replaces the first cell, then at what length of the wire, the balance point occurs? 

A cup of coffee cools from 90°C to 80°C in t minutes, when the room temperature is 20°C. The time taken by a similar cup of coffee to cool from 80°C to 60°C at a room  temperature same at 20°C is ______.

A cup of coffee cools from 90°C to 80°C in t minutes, when the room temperature is 20°C. The time taken by a similar cup of coffee to cool from 80°C to 60°C at a room  temperature same at 20°C is ______.

When a ceiling fan is switched on, it makes 10 rotations in the first 3 second. How many rotations will it make in the next 3 second? (Assume uniform angular acceleration)

Gauss' law helps in ______

Hydraulic brakes are based on ______.

The cross-section of two pistons in a hydraulic lift are 100 cm² and 800 cm² respectively. What is the minimum force required to lift 5000 kg-wt on a large piston surface? (in kN)

A 1000 kg car has four 10 kg wheels. When the car is moving, fraction of total K.E. of the car due to rotation of the wheels about their axles is nearly (Assume wheels be uniform disc)

An object is rolling without slipping on a horizontal surface and its rotational kinetic energy is two-thirds of translational kinetic energy. The body is ______.

A solid spherical ball rolls on an inclined plane without slipping. The ratio of rotational energy and total energy is ______.

A green light is incident from the water to the air-water interface at the critical angle (θ). Select the correct statement. 

From a disc of radius R and mass M, a circular hole of diameter R, whose rim passes through the centre is cut. What is the moment of inertia of the remaining part of the disc about a perpendicular axis, passing through the centre?

The energy per unit volume of a dielectric medium is proportional to the square of ______

A motor boat having a length of 10 m and a breadth of 5 cm is floating on a lake. The boat sinks by 5 cm when the load gets on it. What is the mass of the load?

Which of the following components of an LCR circuit, with a.c. supply, dissipates energy?

A series LCR circuit containing a 5.0 H inductor, 80 µF capacitors, and 40 Ω resistor is connected to a 230 V variable frequency ac source. The angular frequencies of the source at which power is transferred to the circuit are half the power at the resonant angular frequency are likely to be ______.