NEET (UG) entrance exam Question Bank Solutions

A refrigerator works between 4°C and 30°C. It is required to remove 600 calories of heat every second in order to keep the temperature of the refrigerated space constant. The power required is (Take 1 cal = 4.2 joules). 

A body moving along a circular path of radius R with velocity v, has centripetal acceleration a. If its velocity is made equal to 2v. What will be the centripetal acceleration?

If two bulbs of wattages 25 W and 100 W respectively each rated by 220 V are connected in series with the supply of 440 v·then which bulb will fuse?

When cells are connected in parallel, then ______

Ampere's circuital law is used to find out ______

If a body is moving in a circle of radius r with a constant speed v, its angular velocity is ______.

A thick current carrying cable of radius ‘R’ carries current ‘I’ uniformly distributed across its cross-section. The variation of magnetic field B(r) due to the cable with the distance ‘r’ from the axis of the cable is represented by:

A thick current carrying cable of radius ‘R’ carries current ‘I’ uniformly distributed across its cross-section. The variation of magnetic field B(r) due to the cable with the distance ‘r’ from the axis of the cable is represented by ______

The angle between vectors `vecA = 3hati + 4hatj + 5hatk` and `vecB = 6hati + 8hatj + 10hatk` is

If Reynold's number is greater than 3000, the flow of liquid is: 

When a junction transistor is used as an amplifier in CE-mode, 

In order that the heat flows from one part of a solid to another part, what is required?  

Heat energy is incident on the surface at the rate of 1000 J/min. If the coefficient of absorption is 0.8 and the coefficient of reflection is 0.1 then heat energy transmitted by the surface in 5 minutes is ______.

Consider two vectors `vec("F"_1) = 2 hat"i" + 5 hat"k"` and `vec("F"_2) = 3 hat"j" + 4 hat"k"`. The magnitude of the scalar product of these vectors is:

A toroid has a core of inner radius 20 cm and outer radius 22 cm around which 4200 turns of a wire are wound. If the current in the wire is 10 A. What is the magnetic field inside the core of toroid?

Units of electrical energy are ______

In a current-carrying long solenoid, the field produced does not depend upon ______

Magnetic permeability is maximum for ______

A long solenoid has 200 turns per cm and carries a current of 2.5 A. The magnetic field at the center is ______. (µ₀ = 4π × 10^-7 Wb/m-A)

Find the value of the angle of emergence from the prism. The Refractive index of the glass is `sqrt3`.