Are these Physics questions free to attempt?

Yes. You can attempt every Physics question on this page for free without logging in, and check the correct answer with a detailed explanation instantly.

Do I need an account to practise Physics MCQs?

No account is required to attempt questions and view answers. A free account adds bookmarks, personal notes, and progress tracking.

Are these previous year NEET questions?

The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.

Physics NEET Questions — Free MCQ Practice

● ● ● ● ●

Assertion : The specific charge of positive rays is not constant.
Reason : The mass of ions varies with speed.

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

(b) The specific charge (e/m) of the positive rays is not universal constant because these rays may consists of ions of different element.

● ● ● ● ●

Assertion : Photosensitivity of a metal is high if its work function is small.
Reason : Work function = ${hf}_{0}$ where $f_{0}$ is the threshold frequency

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

(b) Less work function means less energy is required for ejecting out the electrons.

● ● ● ● ●

Assertion : The specific charge for positive rays is a characteristic constant.
Reason : The specific charge depends on charge and mass of positive ions present in positive rays.

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

(b) Specific charge of a positive ion corresponding to one gas is fixed but it is different for different gases.

● ● ● ● ●

Assertion : In photoelectric effect, on increasing the intensity of light, both the number of electrons emitted and kinetic energy of each of them get increased but photoelectric current remains unchanged.
Reason : The photoelectric current depends only on wavelength of light.

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

(d) On increasing the intensity of incident light, the current in photoelectric cell will increase. The energy of the photons (hv) will, however not increase with increase in intensity, and hence the kinetic energy of the emitted electrons will not increase.

● ● ● ● ●

Assertion : In photoemissive cell inert gas is used.
Reason : Inert gas in the photoemissive cell gives greater current.

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

(a) The photoemissive cell may be evacuated contain an inert gas at low pressure. An inert gas in the cell gives greater current but causes a time lag in the response of the cell to very rapid changes of radiation which may make it unsuitable for some purpose.

● ● ● ● ●

A plane electromagnetic wave of wave intensity 6 W/ $m^{2}$ strikes a small mirror of area 30 $c m^{2}$ , held perpendicular to the approaching wave. The momentum transferred in kg $m s^{- 1}$ by the wave to the mirror each second will be

A.

$1.2 \times 10^{- 10}$

B.

$2.4 \times 10^{- 9}$

C.

$3.6 \times 10^{- 8}$

D.

$4.8 \times 10^{- 7}$

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

The momentum transferred per second = Force (F)

$F = \frac{2 I A}{C} (F o r p e r f e c t l y r e f l e c t i n g s u r f a c e) = \frac{2 \times 6 \times 30 \times 10^{- 4}}{3 \times 10^{8}} = 1.2 \times 10^{- 10} N$

● ● ● ● ●

The kinetic energy of the electron in an orbit of radius r in the hydrogen atom is (e = electronic charge)

A.

$\frac{k e^{2}}{r^{2}}$

B.

$\frac{k e^{2}}{2 r}$

C.

$\frac{k e^{2}}{r}$

D.

$\frac{k e^{2}}{2 r^{2}}$

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

$\frac{k e^{2}}{r^{2}} = \frac{m v^{2}}{r} \Rightarrow \frac{1}{2} m v^{2} = \frac{k e^{2}}{2 r}$

● ● ● ● ●

Whenever a hydrogen atom emits a photon in the Balmer series:

A.

It may emit another photon in the Balmer series

B.

It must emit another photon in the Lyman series

C.

It may emit another photon in the Paschen series

D.

It need not emit any more photon

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

When hydrogen atom emits a photon in the Balmer series, electron transition occurs from n = 3, n = 4..... etc to n = 2. The electron transition from n = 2 to n = 1 also may take place. Therefore, it must emit a photon in Lyman series.

● ● ● ● ●

The ionisation potential of hydrogen atom is

A.

13.60 volt

B.

8.24 volt

C.

10.36 volt

D.

14.24 bolt

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

$E_{n} = - \frac{13.6}{n^{2}} e V; E_{1} = - 13.6 e V$

To remove electron from n = 1 to n = $\infty$ , 13.6 volt Potential (ionisation potential) is needed.

● ● ● ● ●

Which source is associated with a line emission spectrum?

A.

Electric fibre

B.

Neon street Sign

C.

Red traffic light

D.

Sun

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

In line emission spectrum, every line spectrum consists of a few isolated bright lines, each bright line corresponds to a particular wavelength. It is emitted by atoms in the gaseous state.

e.g a sodium discharge lamp, a mercury vapour lamp, a neon discharge tube and a helium discharge tube all emit sharp lines of definite wavelength.

Physics MCQs for NEET — Practice Questions with Answers

Frequently Asked Questions