enEnglishguગુજરાતી
NEET · Physics · STD 12 -7. Alternating current
The variation of \(EMF\) with time for four types of generators are shown in the figures. Which amongst them can be called \(AC\) ?
- A \((a)\) and \((d)\)
- B \((a), (b), (c)\) and \((d)\)
- C \((a)\) and \((b)\)
- D Only \((a)\)
Answer & Solution
Correct Answer
(B) \((a), (b), (c)\) and \((d)\)
Step-by-step Solution
Detailed explanation
Changing polarity is termed as \(AC.\)
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- Consider a drop of rain water having mass \(1\, g\) falling from a height of \(1\, km.\) It hits the ground with a speed of \(50\, m s^{-1}\). Take \(g\) constant with a value \(10 \, m s^{-1}\). The work done by the \((i)\) gravitational force and the \((ii)\) resistive force of air isNEET 2017 Medium
- The sliding contact \(C\) is at one fourth of the length of the potentiometer wire \(( AB )\) from \(A\) as shown in the circuit diagram. If the resistance of the wire \(AB\) is \(R _0\), then the potential drop \(( V )\) across the resistor \(R\) is
NEET 2022 Medium - A thin spherical shell is charged by some source. The potential difference between the two points \(C\) and \(P\) (in \(V\)) shown in the figure is:(Take \(\frac{1}{4 \pi \varepsilon_0}=9 \times 10^9\) \(SI\) units)
NEET 2024 Medium - One mole of a gas obeying the equation of state \(P(V-b)=R T\) is made to expand from a state with coordinates \(\left(P_{1}, V_{1}\right)\) to a state with \(\left(P_{2}, V_{2}\right)\) along a process that is depicted by a straight line on a \(P-V\) diagram. Then, the work done is given byNEET 2017 Easy
- The equivalent capacitance of the system shown in the following circuit is \(...........\mu F\)
NEET 2023 Easy - A pendulum is hung from the roof of a sufficiently high building and is moving freely to and fro like a simple harmonic oscillator. The acceleration of the bob of the pendulum is \(20\; m/s^2\) at a distance of \(5\; m\) from the mean position. The time period of oscillation isNEET 2018 Medium
More PYQs from NEET
- An electromagnetic wave of wavelength \(\lambda\) is incident on a photosensitive surface of negligible work function. If \(m\) mass is of photoelectron emitted from the surface has de-Broglie wavelength \(\lambda_{\mathrm{d}}\), thenNEET 2021 Medium
- Perigynous flowers are found inNEET 2015 Medium
- Given below are two statements: Statement \(I\): The boiling point of hydrides of Group \(16\) elements follow the order \(\mathrm{H}_2 \mathrm{O}>\mathrm{H}_2 \mathrm{Te}>\mathrm{H}_2 \mathrm{Se}>\mathrm{H}_2 \mathrm{~S}\). Statement \(II\): On the basis of molecular mass, \(\mathrm{H}_2 \mathrm{O}\) is expected to have lower boiling point than the othe members of the group but due to the presence of extensive \(\mathrm{H}\)-bonding in \(\mathrm{H}_2 \mathrm{O}\), it has higher boiling point. In the light of the above statements, choose the correct answer from the options given below:NEET 2024 Medium
- Two similar thin equi-convex lenses, of focallength feach, are kept coaxially in contact with each other such that the focallength of the combination is \(\mathrm{F}_{1}\). When the space between the two lenses is filled with gyoern(which has the same refractive index ( \(\mu =1.5\) ) as that of glass then the equivalent focal length is \(\mathrm{F}_{2} .\) The ratio \(\mathrm{F}_{1}: \mathrm{F}_{2}\) will beNEET 2019 Medium
- In the following palindromic base sequences of DNA, which one can be cut easily by particular restriction enzyme?NEET 2022 Medium
- Receptors for sperm binding in mammals are present on :NEET 2021 Hard