Photon Academy Of Science 04 (Unit 1 Whole)

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    In India frequency of AC is

    • 50Hz
    • 70Hz
    • 30Hz
    • 90Hz
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Photon Academy Of Science 04 (Unit 1 Whole) - Quiz

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  • 2. 

    What is si unit of capacitance 

    • Fairad 

    • C/v

    • N/c

    • Ohm

    Correct Answer
    A. Fairad 
  • 3. 

    Amount of work done in bringing a unit positive charge from infinity to point in an electric field is termed as

    • Potential 

    • Electric field 

    • Electric dipole 

    • Electric flux 

    Correct Answer
    A. Potential 
  • 4. 

    One Joule per coulomb is called?

    • Volt

    • Newton 

    • Fairad 

    • Ohm

    Correct Answer
    A. Volt
  • 5. 

    In domestic wiring we use which type of combination 

    • Paralle 

    • Series 

    • Mixed 

    • Simple 

    Correct Answer
    A. Paralle 
  • 6. 

    What is real form of First principle of electric current 

    • I = neAvd

    • I=q/t

    • I= v/R

    • I= RA/L

    Correct Answer
    A. I = neAvd
  • 7. 

    If two capacitors of lOμF each are connected in parallel, their equivalent capacitance will be?

    • 20 microfairad

    • 10 micrifairad

    • 30 miceofairad 

    • 15 microfairad 

    Correct Answer
    A. 20 microfairad
  • 8. 
    A, B and C are three points in a uniform electric field. The electric potential is [NEET 2013] - ProProfs

    A, B and C are three points in a uniform electric field. The electric potential is [NEET 2013]

    • At A

    • At B

    • At C

    • At all A B and C

    Correct Answer
    A. At all A B and C
  • 9. 
    Which one do you like? - ProProfs

    Which one do you like?

    • A =q  B=r  C= s.  D= p

    • A=p B=q C=r D= s

    • A=s  B= r  C=q  D=p

    • A=r  B=p.C=q D=s

    Correct Answer
    A. A =q  B=r  C= s.  D= p
  • 10. 

    A capacitor stores 0.24 coulombs at 10 volts. Its capacitance is

    • 0.024f

    • 24f

    • 240f

    • 0.240f

    Correct Answer
    A. 0.024f
  • 11. 
     Calculate the equivalent capacitance between the points a and b. - ProProfs

     Calculate the equivalent capacitance between the points a and b.

    • 3c/4

    • 4/3c

    • C/4

    • 3c

    Correct Answer
    A. 3c/4
  • 12. 
    In the electric field due to a point charge q, a test charge is carried from A to the points B, C, D and E lying on the same circle around q. The work done is - ProProfs

    In the electric field due to a point charge q, a test charge is carried from A to the points B, C, D and E lying on the same circle around q. The work done is

    • Zero along any one of the paths AB, AD, AC and AE

    • Least along AB

    • Least along  BC

    • Least along AE

    Correct Answer
    A. Zero along any one of the paths AB, AD, AC and AE
  • 13. 

    A dielectric slab which is responsible for increasing capacitance is

    • Polar 

    • Non polar 

    • Both polar and non polar 

    • Insulator 

    Correct Answer
    A. Polar 
  • 14. 

    Coulomb's force between 2 point charges 10µC and 5µC placed at a distance of 150cm is

    • 0.2N

    • 0.5N

    • 5N

    • 4N

    Correct Answer
    A. 0.2N
  • 15. 

    What would be energy supplied by charge if a point charge of +2 is transferred from a point at potential 100V to a point at potential 50V?

    • 100J

    • 10J

    • 1000J

    • 0J

    Correct Answer
    A. 100J
  • 16. 

    A charge ‘Q’ is placed at the centre of a hemispherical surface of radius ‘R’. The flux of electric field due to charge ‘Q’, through the surface of hemisphere is

    • Q/2εo

    • I/2q

    • Q/4εo

    • 2Q/εo

    Correct Answer
    A. Q/2εo
  • 17. 

    Which one will be show maximum value of resistivity 

    • Metal

    • Non metal 

    • Alloy 

    • Semi conductor 

    Correct Answer
    A. Alloy 
  • 18. 

    If 2 bodies are oppositely charged with 400µC and 200µC, distance between them in air is 0.5 m. force between bodies should be

    • 2880N

    • 2800N

    • 1300N

    • 1440N

    Correct Answer
    A. 2880N
  • 19. 

    Name the event when a metal losses their resistivity at a definite point of temperature is called 

    • Superconductivity 

    • Resistance 

    • Resistivity 

    • Mobility 

    Correct Answer
    A. Superconductivity 
  • 20. 

    A dielectric K = 2 is inserted between the plates of a 20μF capacitor. It capacitance will become  In  

    • 20μF 

    • 40

    • 60

    • 10

    Correct Answer
    A. 40
  • 21. 

    The electric field intensity at a point situated 4 meters from a point charge is 200 N/C. If the distance is reduced to 2 meters, the field intensity will be

    • 800N/C

    • 400N/c

    • 200N/C

    • 100N/c

    Correct Answer
    A. 800N/C
  • 22. 

    An electric dipole is placed at an angle of 30° with an electric field intensity 2 × 105 N/C. It experiences a torque equal to 4 N m. The charge on the dipole, if the dipole length is 2 cm, is [NEET 2016]

    • 8mC

    • 2mC

    • 5mC

    • 7mC

    Correct Answer
    A. 2mC
  • 23. 

    The force between two charges is 120 N. If the distance between the charges is doubled, the force will be

    • 30N

    • 20N

    • 40N

    • 240N

    Correct Answer
    A. 30N
  • 24. 

    If the static electric force is 144 N, what is the distance between both charges… (1μC = 10-6 C and k = 9.109 N.m2.C-2)

    • 5cm

    • 4cm

    • 3cm

    • 9cm

    Correct Answer
    A. 5cm
  • 25. 
    If positively charged pendulum is oscillating in a uniform electric field as shown in figure. Its time period as compared to that when it was uncharged: - ProProfs

    If positively charged pendulum is oscillating in a uniform electric field as shown in figure. Its time period as compared to that when it was uncharged:

    • Will increase

    • No change 

    • Will decrease 

    • Will doubled 

    Correct Answer
    A. Will increase
  • 26. 

    Electric charge q , q and -2q are placed at the corners of an equilateral triangle ABC of side L. The magnitude of electric dipole moment of the system is

    • (√3)qL

    • Ql

    • 2qL

    • 5qL

    Correct Answer
    A. (√3)qL
  • 27. 
    A combination of capacitors is set up as shown in the figure. The magnitude of the electric field, due to a point charge Q (having a charge equal to the sum of the charges on the 4 μF and 9 μF capacitors), at a point distant 30 m from it, would equal : [JEE Main 2016] - ProProfs

    A combination of capacitors is set up as shown in the figure. The magnitude of the electric field, due to a point charge Q (having a charge equal to the sum of the charges on the 4 μF and 9 μF capacitors), at a point distant 30 m from it, would equal : [JEE Main 2016]

    • 360N/C

    • 420N/C

    • 480N/C

    • 240N/C

    Correct Answer
    A. 420N/C
  • 28. 

    Three concentric metallic spherical shells of radii R, 2R, 3R, are given charges Q1, Q2, Q3, respectively. It is found that the surface charge densities on the outer surfaces of the shells are equal. Then, the ratio of the charges given to the shells, Q1 : Q2 : Q3, is [IIT JEE 2009]

    •  1 : 2 : 3

    • 1:3:5

    • 1:4:9

    • 1:8:18

    Correct Answer
    A. 1:4:9
  • 29. 

    What is the value of flux for one face of cube

    • Φ=q/£•

    • 1/6 q/£•

    • Q/l

    • Side x side

    Correct Answer
    A. 1/6 q/£•
  • 30. 

    If we increase length of any conductor wire 10% then what is new value of resistance 

    • 20%

    • 21%

    • 15.5%

    • 30%

    Correct Answer
    A. 21%
  • 31. 
    The figure is a plot of lines of force due to two charges q1 and q2. Find out the sign of charges - ProProfs

    The figure is a plot of lines of force due to two charges q1 and q2. Find out the sign of charges

    • Both are positive 

    • Both are negative 

    • Both are neutral for each other 

    • Can't expressable 

    Correct Answer
    A. Both are negative 

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  • Mar 20, 2022
    Quiz Edited by
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  • Apr 19, 2019
    Quiz Created by
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