NEET (UG) entrance exam Question Bank Solutions

Which of the following is most suitable for the core of an electromagnet?

In a meter bridge experiment, resistance are connected as shown in figure, The balancing length 1, is 55 cm. Now an unknown resistance x is connected in series with P and new balancing length is found to be 75cm. The value of x is ______.

Which of the following is an example of an ideal black body? 

Which of the following series of transitions in the spectrum of hydrogen atom falls in visible region?

The instrument among the following which measures the e.m.f of a cell most accurately 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?

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? 

The maximum energy in the thermal radiation from a hot source occurs at a wavelength of 11 x 10⁻⁵ cm. According to Wien's law, the temperature of the source (on the Kelvin scale) will be n times the temperature of another source (on the Kelvin scale) for which the wavelength at maximum energy is 5.5 x 10⁻⁵ cm. The value of n is:  

Gauss' law helps in ______

Relation between the colour and the temperature of a star is given by ______.

A sphere, a cube and a thin circular plate, all of the same material and same mass are initially heated to same high temperature. 

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

Newton's law of cooling leads to the expression: 

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

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:

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

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?

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 ______

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 ______.

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 ______.