Testbook Logo
Exams SuperCoaching Test Series Skill Academy
More
English
Hindi

Question

Download Solution PDF

The variation of EMF with time for four types of generators is shown in the figures. Which amongst them can be called AC?

F1 Others Madhuri 20-9-22 D5

F1 Others Madhuri 20-9-22 D6

F1 Others Madhuri 20-9-22 D7

F1 Others Madhuri 20-9-22 D8

 

  1. (a) and (b)
  2. only (a)
  3. (a) and (d)
  4. (a), (b), (c), (d)

Answer (Detailed Solution Below)

Option 4 : (a), (b), (c), (d)
Free Tests
View all Free tests >
Free
CT 1: Botany (Cell:The Unit of Life)
30 K Users
25 Questions 100 Marks 20 Mins
Start Now

Detailed Solution

Download Solution PDF

Explanation:

Direct Current is shown in the figure:

Basic Science and Engineering 34 19Q Basic Electricity Rishi Part 1 Hindi - Final images Q4

Alternating Current is shown in the figure

Basic Science and Engineering 34 19Q Basic Electricity Rishi Part 1 Hindi - Final images Q4a

For Direct current magnitude and direction remain the same with time. For Alternating current both magnitude and direction change with time.

∴ All 4 cases satisfy the condition of AC current. 

Hence the correct answer is option 4).

Download Solution PDF
Latest NEET Updates

Last updated on Jun 3, 2025

->NEET provisional answer key 2025 was made available on June 3, 2025 on the official website for the students to check.

->NEET 2025 exam is over on May 4, 2025.

-> The NEET 2025 Question Papers PDF are now available.

-> NTA has changed the NEET UG Exam Pattern of the NEET UG 2025. Now, there will be no Section B in the examination.

-> Candidates preparing for the NEET Exam, can opt for the latest NEET Mock Test 2025. 

-> NEET aspirants can check the NEET Previous Year Papers for their efficient preparation. and Check NEET Cut Off here.

More Alternating Current Questions

Q1.A circuit element 'X' when connected to peak voltage of 200 V, a peak current of 5A flows which lags behind the voltage by \(\frac{\pi}{2}\). A circuit element Y when connected to same peak voltage, same peak current flows which is in phase with the voltage. Now X and Y are connected in series with same peak voltage. The rms value of current through the circuit will be:
Q2.Alternating current cannot be measured by d.c ammeter because: 
Q3.An alternating emf is given by V = 400 sin (100 πt) volt. The rms value of the emf is:
Q4.An electric kettle has two heating coils. When one of the coil is connected to an alternating current source the water in the kettle boils in 10 minutes. When the other coil is used, the same quantity of water takes 15 minutes in boil. How long will it take for the same quantity of water to boil, if the two coils are connected in parallel ? 
Q5.The line that draws power supply to your house from street has
Q6.When a voltage measuring device is connected to AC mains, the meter shows the steady input voltage of 220 V. This means
Q7.If the rms current in a 50 Hz ac circuit is 5 A, the value of the current 1/300 seconds after its value becomes zero is
Q8.The variation of EMF with time for four types of generators is shown in the figures. Which amongst them can be called AC?  
Q9.Which of the following statements is incorrect for alternating current? 
Q10.A series LCR circuit with inductance 10H, capacitance 10 μF, resistance 50Ω is connected to an ac source of voltage, V = 200 sin(100t) volt. If the resonant frequency of the LCR circuit is vo and the frequency of the ac source is v, then:

More Electromagnetic Oscillations and Alternating Current Questions

Q1.For the LCR AC circuit (resonance frequency ωo) shown in the figure below, choose the correct statement(s). List 1 List 2 (i) ω0 a) depends on L,C (ii) At ω =ω0 , VR is   b) independent of L, C (iii) VR and I are  c) In phase (iv)  At ω =ω0 /2, VR is   d) Out of phase  
Q2.To increase the resonant frequency in series LCR circuit,
Q3.A 100 mH inductor is connected to a 157 V, 50 Hz AC source. The peak current of the circuit is _____.
Q4.Which of the following is the best phasor diagram representing the phase relationship between current and voltage in an alternating current source connected to a capacitor? 
Q5.A 220V, 50 Hz ac source is connected in series to a 30 Ω resistor, an inductor, and a capacitor, each having 200 Ω inductive reactance and 160 Ω capacitive reactance, respectively. The voltage drop across the resistor is ______. 
Q6.For a 100 ohm resistor connected to a 220 V, 50 Hz AC supply, the net power consumed over a full cycle is: 
Q7.The average value of alternating current during a full cycle is (i0 is the peak value): 
Q8.A circuit element 'X' when connected to peak voltage of 200 V, a peak current of 5A flows which lags behind the voltage by \(\frac{\pi}{2}\). A circuit element Y when connected to same peak voltage, same peak current flows which is in phase with the voltage. Now X and Y are connected in series with same peak voltage. The rms value of current through the circuit will be:
Q9.Alternating current cannot be measured by d.c ammeter because: 
Q10.An alternating emf is given by V = 400 sin (100 πt) volt. The rms value of the emf is:
Suggested Test Series
View All >
NCERT XI-XII Physics Foundation Pack Mock Test
323 Total Tests with 5 Free Tests
Start Free Test
Physics for Medical Exams Mock Test
74 Total Tests with   2 Free Tests
Start Free Test
Suggested Exams
Exam-Logo
NEET

NEET Important Links

More Physics Questions

Q1. A bar magnet has total length 2l = 20 units and the field point P is at a distance d = 10 units from the centre of the magnet. If the relative uncertainty of length measurement is 1%, then uncertainty of the magnetic field at point P is : 
Q2.A bi-convex lens is constructed using two thin plano-convex lenses, as shown in the figure. The refractive index of the first lens is 1.5, and that of the second lens is 1.2. Both curved surfaces have the same radius of curvature, R = 14 cm. For this bi-convex lens, when the object distance is 40 cm, determine the image distance:
Q3.In a closed system of two interacting particles, m1 and m2, the center of mass is stationary. Given the trajectory of m1 and that m2 = m1, determine the trajectory of m2.
Q4.Match the following entries in column-I and column-II with respect to an oscillating spring-block system: Column-I Column-II (a) Mass of the block is doubled (i) Energy of oscillation becomes 4 times (b) Spring constant is made 4 times (ii) Speed of block becomes 2 times (c) Amplitude of oscillations is doubled (iii) P.E. becomes 4 times (d) Angular frequency is doubled (iv) Time period becomes √2 times (e) length of spring is quadrupled (v) Time period becomes 2 times
Q5.Consider the process of one mole of monatomic ideal gas shown in the T-V diagram. The correct match is based on the following equations and principles: Column - 1 Column - 2 (I) Work done in the isothermal process (1 → 2) (i) (RT0 / 3) ln 2 (II) Change in internal energy (1 → 2 → 3) (ii)RT0 (III) Total heat absorbed (1 → 2 → 3) (iii)  (RT0 / 3) [3 + ln 2] (IV) Heat absorbed in the isothermal process (1 → 2) (iv)  (RT0 / 5) ln 2 (V) Work done in the process (1 → 2→ 3) (v) RT0 /2  
Q6.For the LCR AC circuit (resonance frequency ωo) shown in the figure below, choose the correct statement(s). List 1 List 2 (i) ω0 a) depends on L,C (ii) At ω =ω0 , VR is   b) independent of L, C (iii) VR and I are  c) In phase (iv)  At ω =ω0 /2, VR is   d) Out of phase  
Q7.Match the Following: Match the entries from Column-1 with their corresponding descriptions in Column-2 and numerical values in Column-3. Column - 1 Column - 2 Column - 3 (I) Planck’s radiation law (i) Peak wavelength shifts inversely with temperature (P) 0.5 (II) Stefan-Boltzmann law (ii) Energy radiated is proportional to the fourth power of temperature (Q) 0.25 (III) Kirchhoff’s Law of Radiation (iii) Absorptivity equals emissivity in thermal equilibrium (R) 0.3 (IV) Newton’s Cooling Law (iv) Rate of cooling is proportional to the temperature difference (S) 0.4   A surface reflects 70% of the incident energy. Determine the most appropriate match for its emissivity.  
Q8.A ball of 8 kg, moving at 15 m/s, enters a 22 kg spring gun at rest. If the surfaces are frictionless and the spring is massless, determine the gun's speed after the ball stops moving relative to the gun.
Q9.A square frame is constructed from four uniform rods. The rods, AB, BC, CD, and DA, have masses 2m, 3m, 4m, and 5m respectively, and each has a length of 2a.  Where is the center of mass of this frame located in the x-y plane, specifically, which quadrant or region defined by x and y coordinates.
Q10.Imagine you have a cup of Starbucks coffee in a moving car. If the car suddenly brakes
Exams
Board Exams
Syllabus
Test Series
Previous Year Papers
Cut Off
Eligibility
Important Exams
Testbook USA SAT Exam
Testbook USA ACT Exam
US College Admissions Guide
Testbook Edu Solutions Pvt. Ltd.
1st & 2nd Floor, Zion Building,
Plot No. 273, Sector 10, Kharghar,
Navi Mumbai - 410210
[email protected]
Toll Free:1800 833 0800
Office Hours: 10 AM to 7 PM (all 7 days)
Company
About usCareers We are hiringTeach Online on TestbookPartnersMediaSitemap
Products
Test SeriesTestbook PassOnline CoursesOnline VideosPracticeBlogRefer & EarnBooks
Our Apps
Follow us on
Copyright © 2014-2022 Testbook Edu Solutions Pvt. Ltd.: All rights reserved
User PolicyTermsPrivacy
Get Free Access Now
Hot Links： teen patti bliss happy teen patti online teen patti