OnlineCBT
Physics · PYQ NEET UG 2021
Practice questions & answers
Find a question, read its answer and explanation, then practise related questions.
Physics PYQ NEET UG 2021 · Clear filters
50 questions
Physics · PYQ NEET UG 2021
The half-life of a radioactive nuclide is \( 100\text{ hours} \). The fraction of original activity that will remain after \( 150\text{ hours} \) would be:
Read answer →Physics · PYQ NEET UG 2021
Match List-I with List-II: List-I List-II A Drift Velocity P \( \frac{m}{ne^2\rho} \) B Electrical Resistivity Q \( nev_d \) C Relaxation Period R \( \frac{eE}{m}\tau \) D Current Density S \( \frac{E}{J} \)
Read answer →Physics · PYQ NEET UG 2021
In the product \( \vec{F} = q(\vec{v} \times \vec{B}) = qv \times (B_1\hat{i} + B_2\hat{j} + B_3\hat{k}) \) For \( q = 1 \) and \( \vec{v} = 2\hat{i} + 4\hat{j} + 6\hat{k} \) and \( \vec{F} = 4\hat{i} - 20\hat{j} + 12\hat{k} \) What will be the complete expression for \( \vec{B} \)?
Read answer →Physics · PYQ NEET UG 2021
A particle is released from height S from the surface of the Earth. At a certain height its kinetic energy is three times its potential energy. The height from the surface of earth and the speed of the particle at that instant are respectively:
Read answer →Physics · PYQ NEET UG 2021
A body is executing simple harmonic motion with frequency 'n', the frequency of its potential energy is:
Read answer →Physics · PYQ NEET UG 2021
A particle of mass 'm' is projected with a velocity \( v = kv_e \) (\( k < 1 \)) from the surface of the earth. (\( v_e \) = escape velocity). The maximum height above the surface reached by the particle is:
Read answer →Physics · PYQ NEET UG 2021
The number of photons per second on an average emitted by the source of monochromatic light of wavelength \( 600\text{ nm} \), when it delivers the power \( 3.3 \times 10^{-3}\text{ watt} \) will be: \( (h = 6.6 \times 10^{-34}\text{ Js)} \)
Read answer →Physics · PYQ NEET UG 2021
Consider the following statements (A) and (B) and identify the correct answer. (A) A Zener diode is connected in reverse bias, when used as a voltage regulator. (B) The potential barrier of a p-n junction lies between \( 0.1\text{ V} \) to \( 0.3\text{ V} \).
Read answer →Physics · PYQ NEET UG 2021
Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional force are 10% of the input energy. How much power is generated by the turbine? \( (g = 10\text{ m/s}^2) \)
Read answer →Physics · PYQ NEET UG 2021
'R' त्रिज्या के एक मोटे धारावाही केबल में धारा 'I' इसके अनुप्रस्थ काट पर एक समान रूप से वितरित है। केबल के अक्ष से दूरी 'r' के साथ केबल के कारण चुंबकीय क्षेत्र B(r) का परिवर्तन किसके द्वारा प्रदर्शित होता है?
Read answer →Physics · PYQ NEET UG 2021
A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since:
Read answer →Physics · PYQ NEET UG 2021
A uniform rod of length \( 200 \text{ cm} \) and mass \( 500 \text{ g} \) is balanced on a wedge placed at \( 40 \text{ cm} \) mark. A mass of \( 2 \text{ kg} \) is suspended from the rod at \( 20 \text{ cm} \) and another unknown mass 'm' is suspended from the rod at \( 160 \text{ cm} \) mark as shown in the figure. Find the value of 'm' such that the rod is in equilibrium. (\( g = 10 \text{ m/s}^2 \))
Read answer →Physics · PYQ NEET UG 2021
The effective resistance of a parallel connection that consists of four wires of equal length, equal area of cross-section and same material is \( 0.25\,\Omega \). What will be the effective resistance if they are connected in series?
Read answer →Physics · PYQ NEET UG 2021
The electron concentration in an n-type semiconductor is the same as hole concentration in a p-type semiconductor. An external field (electric) is applied across each of them. Compare the currents in them.
Read answer →Physics · PYQ NEET UG 2021
Two conducting circular loops of radii \( R_1 \) and \( R_2 \) are placed in the same plane with their centres coinciding. If \( R_1 \gg R_2 \), the mutual inductance M between them will be directly proportional to:
Read answer →Physics · PYQ NEET UG 2021
The equivalent capacitance of the combination shown in the figure is:
Read answer →Physics · PYQ NEET UG 2021
A screw gauge gives the following readings when used to measure the diameter of a wire Main scale reading: \( 0\text{ mm} \) Circular scale reading: \( 52\text{ divisions} \) Given that \( 1\text{ mm} \) on main scale corresponds to \( 100\text{ divisions} \) on the circular scale. The diameter of the wire from the above data is:
Read answer →Physics · PYQ NEET UG 2021
A spring is stretched by \( 5\text{ cm} \) by a force \( 10\text{ N} \). The time period of the oscillations when a mass of \( 2\text{ kg} \) is suspended by it is
Read answer →Physics · PYQ NEET UG 2021
दिए गए परिपथ के लिए, टर्मिनलों A, B और C पर इनपुट डिजिटल सिग्नल लागू किए जाते हैं। टर्मिनल Y पर आउटपुट क्या होगा?
Read answer →Physics · PYQ NEET UG 2021
A point object is placed at a distance of \( 60 \text{ cm} \) from a convex lens of focal length \( 30 \text{ cm} \). If a plane mirror were put perpendicular to the principal axis of the lens and at a distance of \( 40 \text{ cm} \) from it, the final image would be formed at a distance of:
Read answer →Physics · PYQ NEET UG 2021
For a plane electromagnetic wave propagating in x-direction, which one of the following combination gives the correct possible directions for electric field (E) and magnetic field (B) respectively?
Read answer →Physics · PYQ NEET UG 2021
In a potentiometer circuit a cell of EMF \( 1.5\text{ V} \) gives balance point at \( 36\text{ cm} \) length of wire. If another cell of EMF \( 2.5\text{ V} \) replaces the first cell, then at what length of the wire, the balance point occurs?
Read answer →Physics · PYQ NEET UG 2021
