How long will it take to transmit the information 30km away in space ?
You've reached today's free limit of 20 questions.
Log in to keep practising for free.
Physics MCQs for NEET — Practice Questions with Answers
Practice free Physics NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
When electromagnetic waves enter the ionised layer of ionosphere, the relative permitting of the ionised layer
You've reached today's free limit of 20 questions.
Log in to keep practising for free.
In which of the following media the wave propagation occurs with out attention ?
You've reached today's free limit of 20 questions.
Log in to keep practising for free.
Two wires of equal lengths, equal diameters and having resistivities $ \rho _1 and \rho_2 $ are connected in series .The equivalent resistivity of the combination is....
You've reached today's free limit of 20 questions.
Log in to keep practising for free.
Explanation
$R = R_1 + R_2 = { \rho_1 L \over A} +{ \rho _2 L \over A } = { L \over A} (\rho_1 + \rho_2) .......(1)$ $ R = { \rho (2L) \over A} ......(2)$ $ Equation (1) and (2) gives = \rho = 1/2 (\rho_1 + \rho_2) $ $ I_1 = {12 V \over 4 \Omega } = 3A$
The effective resistance of a n number of resistors connected in parallel in x ohm. When one of the resistors is removed, the effective resistance becomes y ohm. The resistance of the resistor that is removed is....
You've reached today's free limit of 20 questions.
Log in to keep practising for free.
Explanation
$ {1 \over R_1 }+ {1 \over R_2 }+.....+{1 \over R_{n-1} }+{1 \over R_n } = {1 \over x } .....(1)$ $ \Rightarrow If the n^{th} resistor is removed , then $ $ {1 \over R_1 }+ {1 \over R_2 }+.....+{1 \over R_{n-1} }+{1 \over R_n } = {1 \over y } .....(2)$ Subtracting (2) form (1), we have $ {1 \over R_n }= {1 \over x } - { 1 \over y}$ $$Which given {R_n} = {xy \over (y-x)} which is choice (B)$$
when a cell is connected to a resistance $R_1$ the rate at which heat is generated
in it is the same as when the cell is connected to a resistance $R_ 2 < R_1$
the internal resistance of the cell is....
You've reached today's free limit of 20 questions.
Log in to keep practising for free.
Explanation
$ I = { E \over (R_1 + r )} \Rightarrow Q_1 = I^2 R_1 = [ { E \over (R_1 + r)}]^2 R_1$ $ Q_2 = [ { E \over (R_2 + r)}]^2 R_2$ $Equating Q_1 and Q_2 simplifying, we get \,r = \sqrt { R_1 R_2} $
Two batteries each of emf 2V and internal resistance $1 \Omega $ are connected in series to a resistor R. Maximum Possible power consumed by the resistor = ....
You've reached today's free limit of 20 questions.
Log in to keep practising for free.
Explanation
$ Max power = n ({ E^2 \over 4r})$
In an experiment to measure the internal resistance of a cell by a potentiometer it is found that all the balance points at a length of 2m when the cell is shunted by a 5 ohm resistance and is at a length of 3m when the cell is shunted by a 10 ohm resistance, the internal resistance of the cell is then :
You've reached today's free limit of 20 questions.
Log in to keep practising for free.
Explanation
$ r = ({ l_1 \over l_2} -1) R$
Two wires of the metal have the same length but their cross-sections are in the ratio 3:1 They are joined in series: The resistance of the thicker wire is $ 10 \Omega $ . The total resistance of the combination will be
You've reached today's free limit of 20 questions.
Log in to keep practising for free.
Explanation
$ R_1 = { \delta l \over 3 } = 10 \Omega , R _2 ={ \delta l \over 1} = 30 \Omega $ $ Rs = R_1 + R_2 = 10 \Omega + 30 \Omega = 40 \Omega $
A wire 50cm long and $1 mm^2$ in cross-section carries a curent of 4A when connected to a 2V battery. The resistivity of the wire is:
You've reached today's free limit of 20 questions.
Log in to keep practising for free.
Explanation
Ready to ace NEET?
Free access · No credit card required
Frequently Asked Questions
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.
No account is required to attempt questions and view answers. A free account adds bookmarks, personal notes, and progress tracking.
The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.