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This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What conclusion do you get from the observation that a current-carrying wire deflects a compass placed near it ? |
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Answer» What conclusion do you get from the observation that a current-carrying wire deflects a compass placed near it ? |
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| 2. |
The wattage of a bulb is 24 W when it is connected to a 12 V battery. Calculate its effective wattage if it operates on a 6 V battery. |
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Answer» The wattage of a bulb is 24 W when it is connected to a 12 V battery. Calculate its effective wattage if it operates on a 6 V battery. |
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| 3. |
In a step by step manner, mention the immediate actions to be taken when we see a person get electric shock. |
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Answer» In a step by step manner, mention the immediate actions to be taken when we see a person get electric shock. |
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| 4. |
The figure illustrates plane figures made of thin conductors which are located in a uniform magnetic field directed away from the reader, perpendicular to the plane of drawing. The magnetic field starts decreasing. The currents induced in these loops are directed as |
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Answer» The figure illustrates plane figures made of thin conductors which are located in a uniform magnetic field directed away from the reader, perpendicular to the plane of drawing. The magnetic field starts decreasing. The currents induced in these loops are directed as |
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| 5. |
How is nuclear energy generated? And why is it's large scale use prohibited? |
| Answer» How is nuclear energy generated? And why is it's large scale use prohibited? | |
| 6. |
In an LCR circuit, at resonance |
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Answer» In an LCR circuit, at resonance |
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| 7. |
Name and state the action and reaction in the following cases 1 firing a bullet from a gun 2 hammering a nail 3 a book lying on the table 4 a moving rocket 5 a person walking on the floor 6 a moving traun colliding with a stationary train 7 pulling of a cart by horse |
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Answer» Name and state the action and reaction in the following cases 1 firing a bullet from a gun 2 hammering a nail 3 a book lying on the table 4 a moving rocket 5 a person walking on the floor 6 a moving traun colliding with a stationary train 7 pulling of a cart by horse |
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| 8. |
During a negative beta decay, |
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Answer» During a negative beta decay, |
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| 9. |
46.How to find electric field or potential at an equatorial point of a ring." |
| Answer» 46.How to find electric field or potential at an equatorial point of a ring." | |
| 10. |
a body is projected with velocity kve in vertically upward direction from the ground into space. it is given that ve is escape velocity & k |
| Answer» a body is projected with velocity kve in vertically upward direction from the ground into space. it is given that ve is escape velocity & k<1.if air resistance is considered to be negligible , then the maximum height from the centre of the earth to which it can go will be n nt(R=radius of the earth) n nta) R / I-k n ntb) R (I-k) n ntc) R /1-k n ntd) R /1+k | |
| 11. |
Question 2 An electric motor takes 5 A from a 220 V line. Determine the power of the motor and the energy consumed in 2 h. |
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Answer» Question 2 An electric motor takes 5 A from a 220 V line. Determine the power of the motor and the energy consumed in 2 h. |
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| 12. |
The equivalent resistance of a group of resistances is R. If another resistance is connected in parallel to the group, its new equivalent becomes R1 & if it is connected in series to the group, its new equivalent becomes R2. We have |
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Answer» The equivalent resistance of a group of resistances is R. If another resistance is connected in parallel to the group, its new equivalent becomes R1 & if it is connected in series to the group, its new equivalent becomes R2. We have |
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| 13. |
given that a photon of light of wavelength 10000Ang has energy 1.23eV. now when the light ofintensity Io and wavelength 5000Ang falls on a photo cell the saturation current and stopping potential are 0.40micro ampere and 1.36V respectively. the work function |
| Answer» given that a photon of light of wavelength 10000Ang has energy 1.23eV. now when the light ofintensity Io and wavelength 5000Ang falls on a photo cell the saturation current and stopping potential are 0.40micro ampere and 1.36V respectively. the work function | |
| 14. |
A ball of mass 7.2 kg is launched from the Earth's surface to a circular orbit at a height of 350 km from the surface. In doing so, what is the change in mechanical energy of the ball? (A) 250MJ (B) 317MJ (C) 213MJ (D) zero |
| Answer» A ball of mass 7.2 kg is launched from the Earth's surface to a circular orbit at a height of 350 km from the surface. In doing so, what is the change in mechanical energy of the ball? (A) 250MJ (B) 317MJ (C) 213MJ (D) zero | |
| 15. |
A converging bundle of light rays in the shape ofcone with a vertex angle of 45 falls on a circulardiaphragm of 20 cm diameter. A lens with power5 D is fixed in the diaphragm. Diameter of face oflens is equal to that of diaphragm. If the vertexangle of new cone is θ , then tanθ = (1) 1.5(2) 2 (3) \sqrt3 (4) 3 |
| Answer» A converging bundle of light rays in the shape ofcone with a vertex angle of 45 falls on a circulardiaphragm of 20 cm diameter. A lens with power5 D is fixed in the diaphragm. Diameter of face oflens is equal to that of diaphragm. If the vertexangle of new cone is θ , then tanθ = (1) 1.5(2) 2 (3) \sqrt3 (4) 3 | |
| 16. |
a solid current carrying conductor of radius R is having current per unit area J =ar/R where a is a cons†an t and r is dis†an ce from the axis. find magnetic field at dis†an ce x from axis of wire assume x> |
| Answer» a solid current carrying conductor of radius R is having current per unit area J =ar/R where a is a cons†an t and r is dis†an ce from the axis. find magnetic field at dis†an ce x from axis of wire assume x> | |
| 17. |
Consider an LTI system with transfer function, H(s)=1s(s+10). If input to the system is cos 2t and the steady state output is Asin(2t+a), then the value of A is _______(Answer upto 2 decimal places)0.05 |
Answer» Consider an LTI system with transfer function, H(s)=1s(s+10). If input to the system is cos 2t and the steady state output is Asin(2t+a), then the value of A is _______(Answer upto 2 decimal places)
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| 18. |
Will a circular loop of bigger radius produce higher magnetic field than a loop of smaller radius. If current flowing is same give reason. |
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Answer» Will a circular loop of bigger radius produce higher magnetic field than a loop of smaller radius. If current flowing is same give reason. |
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| 19. |
31. A uniform spring moving force constant k is cut into two parts having lengths in the ratio 2:3. Find force constant of smaller part. |
| Answer» 31. A uniform spring moving force constant k is cut into two parts having lengths in the ratio 2:3. Find force constant of smaller part. | |
| 20. |
__________ is a region where a magnet exhibits its magnetic influence. |
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Answer» __________ is a region where a magnet exhibits its magnetic influence. |
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| 21. |
Question 27 In a village in Karnataka, people started cultivating crops all around a lake which was always filled with water. They added fertilisers to their field in order to enhance the yield. Soon they discovered that the waterbody was completely covered with green floating plants and fishes started dying in large numbers. Analyze the situation and give reasons for excessive growth of plants and death of fish in the lake. |
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Answer» Question 27 |
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| 22. |
The primary and the secondary coil of a transformer have 50 and 1500 turns, respectively. If the magnetic flux ϕ linked with the primary coil is given by ϕ=ϕ0+4t, where ϕ is in Wb, t is the time in s and ϕ0 is a constant, the output voltage across the secondary coil is |
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Answer» The primary and the secondary coil of a transformer have 50 and 1500 turns, respectively. If the magnetic flux ϕ linked with the primary coil is given by ϕ=ϕ0+4t, where ϕ is in Wb, t is the time in s and ϕ0 is a constant, the output voltage across the secondary coil is |
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| 23. |
What is reverberation? |
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Answer» What is reverberation? |
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| 24. |
Arrange the following radiation in the order of increasing wavelength: |
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Answer» Arrange the following radiation in the order of increasing wavelength: |
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| 25. |
A resistance and an inductance are connected in series across an AC voltage, V=100 sin(10t). The current in this circuit is given by, I=4 sin(10t−π/4). The values of the inductance and resistance are, respectively, |
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Answer» A resistance and an inductance are connected in series across an AC voltage, V=100 sin(10t). The current in this circuit is given by, I=4 sin(10t−π/4). The values of the inductance and resistance are, respectively, |
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| 26. |
Motion described by two different objects are shown in the figure. The ratio of accleration of the objects i.e. aAaB is |
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Answer» Motion described by two different objects are shown in the figure. The ratio of accleration of the objects i.e. aAaB is |
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| 27. |
38.A part of circuit is shown in figure.Here reading of ammeter is 5A and voltmeter is 100 V. If voltmeter resistance is 2500 ohm, then the resistance R is approximately 1)20 2)10 3)100 4)200 |
| Answer» 38.A part of circuit is shown in figure.Here reading of ammeter is 5A and voltmeter is 100 V. If voltmeter resistance is 2500 ohm, then the resistance R is approximately 1)20 2)10 3)100 4)200 | |
| 28. |
A wire abc is carrying current i. It is bent as shown in the figure, and is placed in a uniform magnetic field of magnetic induction B. The length of ab is l and ∠abc=45∘. The ratio of magnetic force on ab to that on bc is: |
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Answer» A wire abc is carrying current i. It is bent as shown in the figure, and is placed in a uniform magnetic field of magnetic induction B. The length of ab is l and ∠abc=45∘. The ratio of magnetic force on ab to that on bc is: |
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| 29. |
A solenoid wound over a rectangular frame. If all the linear dimensions of frame are increased by a a factor 3 and numbers of turns per unit length remains same , the self inductance increased by a factor of? |
| Answer» A solenoid wound over a rectangular frame. If all the linear dimensions of frame are increased by a a factor 3 and numbers of turns per unit length remains same , the self inductance increased by a factor of? | |
| 30. |
Tyndall effect is the scattering of the light by _________. |
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Answer» Tyndall effect is the scattering of the light by _________. |
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| 31. |
7. Two concave lens L, and L, are kept in contact witeach other. If the space between the two lens is filledwith a material of refractive index u 1, the magnitudeof the focal length of the combination |
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Answer» 7. Two concave lens L, and L, are kept in contact wit each other. If the space between the two lens is filled with a material of refractive index u 1, the magnitude of the focal length of the combination |
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| 32. |
The metal pieces which are welded together with the armature coil to facilitate flow of current in an AC generator are known as _____ |
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Answer» The metal pieces which are welded together with the armature coil to facilitate flow of current in an AC generator are known as _____ |
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| 33. |
When a potential difference is applied across the resistor, the movement of electrons will be: |
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Answer» When a potential difference is applied across the resistor, the movement of electrons will be: |
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| 34. |
Identify the condition in which image formed is real, inverted and diminished from the following. |
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Answer» Identify the condition in which image formed is real, inverted and diminished from the following. |
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| 35. |
Explain with an experiment principle of Electromagnetic induction? Which law will gives the direction of electric current? [5 MARKS] |
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Answer» Explain with an experiment principle of Electromagnetic induction? Which law will gives the direction of electric current? [5 MARKS] |
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| 36. |
Find the resistance of a hollow cylindrical pipe of length 1 m whose inner and outer radii are 10 cm and 20 cm respectively. Assume that the cylindrical pipe is made of a material of resistivity 2×10−8 Ω m. |
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Answer» Find the resistance of a hollow cylindrical pipe of length 1 m whose inner and outer radii are 10 cm and 20 cm respectively. Assume that the cylindrical pipe is made of a material of resistivity 2×10−8 Ω m. |
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| 37. |
The values of current (I) flowing through a given resistor of resistance (R), for the corresponding values of potential difference (V) across the resistor are given below : V (volts)0.51.01.52.02.53.04.05.0I (amperes)0.10.20.30.40.50.60.81.0 Plot a graph between current (I) and potential difference (V) and determine the resistance (R) of the resistor. |
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Answer» The values of current (I) flowing through a given resistor of resistance (R), for the corresponding values of potential difference (V) across the resistor are given below : V (volts)0.51.01.52.02.53.04.05.0I (amperes)0.10.20.30.40.50.60.81.0 Plot a graph between current (I) and potential difference (V) and determine the resistance (R) of the resistor. |
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| 38. |
How much work is done, when 1 coulomb of charge moves against a potential difference of 1 volt? |
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Answer» How much work is done, when 1 coulomb of charge moves against a potential difference of 1 volt? |
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| 39. |
ntthe activity of a sample of radioactive material is A1 ,at time t1 ,and A2 at time t2 (t2>t1).if its mean life T ,thenn |
| Answer» ntthe activity of a sample of radioactive material is A1 ,at time t1 ,and A2 at time t2 (t2>t1).if its mean life T ,thenn | |
| 40. |
a ray of light is incident normally on a glass sphere of refractive index 1.414 then angle of emergence will be? |
| Answer» a ray of light is incident normally on a glass sphere of refractive index 1.414 then angle of emergence will be? | |
| 41. |
40. Wavelength of radiations emitted when an electron jumps from state A to C is 3000 Armstrong and it is 6000 Armstrong when it jumps from B to C. Wavelength of radiations emitted when electron jumps from A to B will be |
| Answer» 40. Wavelength of radiations emitted when an electron jumps from state A to C is 3000 Armstrong and it is 6000 Armstrong when it jumps from B to C. Wavelength of radiations emitted when electron jumps from A to B will be | |
| 42. |
What is the C.G.S. unit of heat |
| Answer» What is the C.G.S. unit of heat | |
| 43. |
Show that the electric permittivity(ε0) of a medium and the dielectric constant of the medium are numerically same in CGS method. |
| Answer» Show that the electric permittivity(ε0) of a medium and the dielectric constant of the medium are numerically same in CGS method. | |
| 44. |
Why the force between two dipole when their axis are perpendicular to each other is zero? |
| Answer» Why the force between two dipole when their axis are perpendicular to each other is zero? | |
| 45. |
Mention the types of mirrors used as (i) rear view mirrors, (ii) shaving mirrors. List two reasons to justify your answers in each case. |
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Answer» Mention the types of mirrors used as (i) rear view mirrors, (ii) shaving mirrors. List two reasons to justify your answers in each case. |
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| 46. |
23. T_c and Pc_{}of gas are 400 K and 41 atm,respectively. The V_{c {{}}_{ |
| Answer» 23. T_c and Pc_{}of gas are 400 K and 41 atm,respectively. The V_{c {{}}_{ | |
| 47. |
An object is placed in front of a convex lens of focal length 11 cm. If the image formed is virtual and has a magnification of 2, the distance of the object from the lens is - |
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Answer» An object is placed in front of a convex lens of focal length 11 cm. If the image formed is virtual and has a magnification of 2, the distance of the object from the lens is - |
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| 48. |
Magnification produced by a convex mirror is always : (a) more than 1 (b) less than 1 (c) equal to 1 (d) more or less than 1 |
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Answer» Magnification produced by a convex mirror is always : (a) more than 1 (b) less than 1 (c) equal to 1 (d) more or less than 1 |
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| 49. |
In an electrical circuit, three incandescent bulbs A, B and C of rating 40 W, 60 W and 100 W respectively are connected in parallel to an electric source. Which of the following is likely to happen regarding their brightness? |
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Answer» In an electrical circuit, three incandescent bulbs A, B and C of rating 40 W, 60 W and 100 W respectively are connected in parallel to an electric source. Which of the following is likely to happen regarding their brightness? |
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| 50. |
A refrigerator uses R−134a as its refrigerant and operates on an ideal vapour compression refrigeration cycle between 0.14MPa and 0.8MPa. If the mass flow rate of the refrigerant is 0.05kg/s, the rate of heat rejection to the environment is \(kW\).Given data :At P=0.14MPa,h=236.04 kJ/kg,s=0.9322 kJ/kgK At P=0.8 MPa,h=272.05 kJ/kg(superheated vapour)At P=0.8 MPa,h=93.42 kJ/kg(saturated liquid) |
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Answer» A refrigerator uses R−134a as its refrigerant and operates on an ideal vapour compression refrigeration cycle between 0.14MPa and 0.8MPa. If the mass flow rate of the refrigerant is 0.05kg/s, the rate of heat rejection to the environment is \ Given data : At P=0.14MPa,h=236.04 kJ/kg,s=0.9322 kJ/kgK At P=0.8 MPa,h=272.05 kJ/kg(superheated vapour) At P=0.8 MPa,h=93.42 kJ/kg(saturated liquid) |
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