Saved Bookmarks
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. |
two lenses of power +2.50 D and -3.75 D are combined to form a compound lens. Its focal length in cm will be- (1) 40 (2) -40 (3) -80 (4) 160 |
| Answer» two lenses of power +2.50 D and -3.75 D are combined to form a compound lens. Its focal length in cm will be- (1) 40 (2) -40 (3) -80 (4) 160 | |
| 2. |
Three copper blocks of masses m1, m2, and m3 kg respectively are brought into thermal contact till they reach equilibrium. Before contact, they were at T1,T2,T3(T1>T2>T3). Assuming there is no heat loss to the surroundings, the equilibrium temperature T is (S is the specific heat of copper). |
|
Answer» Three copper blocks of masses m1, m2, and m3 kg respectively are brought into thermal contact till they reach equilibrium. Before contact, they were at T1,T2,T3(T1>T2>T3). Assuming there is no heat loss to the surroundings, the equilibrium temperature T is (S is the specific heat of copper). |
|
| 3. |
Electricity and magnetism are said to be inter-related to each other. A current carrying conductor has a magnetic field around it. So, when a compass is brought near to it, we can observe a deflection in the compass. Similarly, a battery is the source of the electric current. What will be the deflection, when we bring a compass near a 3 V cell (battery)? |
|
Answer» Electricity and magnetism are said to be inter-related to each other. A current carrying conductor has a magnetic field around it. So, when a compass is brought near to it, we can observe a deflection in the compass. Similarly, a battery is the source of the electric current. What will be the deflection, when we bring a compass near a 3 V cell (battery)? |
|
| 4. |
Which is the country having the largest number of hydroelectric dams? |
|
Answer» Which is the country having the largest number of hydroelectric dams? |
|
| 5. |
In rational kinetic energy KE = 1/2 I (w) square Where, I stand for what? w stand for what? |
|
Answer» In rational kinetic energy KE = 1/2 I (w) square Where, I stand for what? w stand for what? |
|
| 6. |
A fan of 10ohm, a bulb of 2ohm and a tubelight of 5ohm are connected in series across a 220voltage supply for 5 hours a day.a) What is the total resistance in the circuit ?b) What is the current flowing through each appliance ?c) What is the power of each appliance ?d) Find the monthly bill 3 per unit. |
|
Answer» A fan of 10ohm, a bulb of 2ohm and a tubelight of 5ohm are connected in series across a 220 voltage supply for 5 hours a day. a) What is the total resistance in the circuit ? b) What is the current flowing through each appliance ? c) What is the power of each appliance ? d) Find the monthly bill 3 per unit. |
|
| 7. |
The unit of the coefficient of thermal conductivity is____. |
|
Answer» The unit of the coefficient of thermal conductivity is____. |
|
| 8. |
The vertical deflection of point ′B′ for the beam AB shown in figure is given as δB=Pl3αEI. (correct upto two decimals) is24 |
Answer» The vertical deflection of point ′B′ for the beam AB shown in figure is given as δB=Pl3αEI. (correct upto two decimals) is
|
|
| 9. |
A light ray is incident perpendicularly to one face of a 900prism and is totally internally reflected at the glass-air interface.If the angle of reflection is 450, we conclude that the refractive index 'n' will beDiagram |
|
Answer» A light ray is incident perpendicularly to one face of a 900prism and is totally internally reflected at the glass-air interface. |
|
| 10. |
A body covers 12m in 2nd sec. and20m in 4th sec. the distance the body will cover in first 4sec. Is |
| Answer» A body covers 12m in 2nd sec. and20m in 4th sec. the distance the body will cover in first 4sec. Is | |
| 11. |
Both the focal lengths of a lens are equal when................... |
|
Answer» Both the focal lengths of a lens are equal when................... |
|
| 12. |
An induced current is produced when a magnet is moved into a coil. Does the magnitude of induced current depend on the number of turns of the coil? If so, how? |
|
Answer» An induced current is produced when a magnet is moved into a coil. Does the magnitude of induced current depend on the number of turns of the coil? If so, how? |
|
| 13. |
A wire shaped to a regular hexagon if side 2cm carries a currenr of 2A. Find the magnetic field at the centre of hexagon |
| Answer» A wire shaped to a regular hexagon if side 2cm carries a currenr of 2A. Find the magnetic field at the centre of hexagon | |
| 14. |
An erect image 2.0 cm high is formed 12 cm from a lens, the object being 0.5 cm high. Find the focal length of the lens. |
|
Answer» An erect image 2.0 cm high is formed 12 cm from a lens, the object being 0.5 cm high. Find the focal length of the lens. |
|
| 15. |
an electron is projected along positive z axis magnetic field is present along positive y axis , then direction of initial accleration of particle is |
| Answer» an electron is projected along positive z axis magnetic field is present along positive y axis , then direction of initial accleration of particle is | |
| 16. |
If 10kj heat is given to a gas at constant pressure and the gas expands from 5l to 10lagainst 2 atm pressure. Find the internal energy change of the gas? |
|
Answer» If 10kj heat is given to a gas at constant pressure and the gas expands from 5l to 10l against 2 atm pressure. Find the internal energy change of the gas? |
|
| 17. |
24. If radius of earth reduces by 4% and densityremains same, then find escape velocity change.(1) Reduce by 2%(2) Increase by 2%(3) Reduce by 4%(4) Increase by 4% |
| Answer» 24. If radius of earth reduces by 4% and densityremains same, then find escape velocity change.(1) Reduce by 2%(2) Increase by 2%(3) Reduce by 4%(4) Increase by 4% | |
| 18. |
Which of the following properties of an alternating current is correct? |
|
Answer» Which of the following properties of an alternating current is correct? |
|
| 19. |
when a charged particle enters a magnetic field. what things remains constant |
|
Answer» when a charged particle enters a magnetic field. what things remains constant |
|
| 20. |
The diameter of aperture of a plano-convex lens is 6 cm and its maximum thickness is 3 mm. If the velocity of light in the material of the lens is 2×108 m/s, its focal length is (approximately) |
|
Answer» The diameter of aperture of a plano-convex lens is 6 cm and its maximum thickness is 3 mm. If the velocity of light in the material of the lens is 2×108 m/s, its focal length is (approximately) |
|
| 21. |
To compensate the relativistic variation of mass at high speed of charge in cyclotron.Adjustments can be made is (1) Frequency of a.c.is decreased (2) Magnetic field is increased (3) Peak value of a.c.is increased (4) Both (1) & (2) |
|
Answer» To compensate the relativistic variation of mass at high speed of charge in cyclotron.Adjustments can be made is (1) Frequency of a.c.is decreased (2) Magnetic field is increased (3) Peak value of a.c.is increased (4) Both (1) & (2) |
|
| 22. |
(a) What is meant by short-circuiting in electric supply?(b) What is the function of earth wire in electrical instruments?(c) What is the usual current rating of the fuse wire in the power supply line which runs(i) lights and fans, and (ii) appliances of 2 kW power? |
|
Answer» (a) What is meant by short-circuiting in electric supply? (b) What is the function of earth wire in electrical instruments? (c) What is the usual current rating of the fuse wire in the power supply line which runs (i) lights and fans, and (ii) appliances of 2 kW power? |
|
| 23. |
Calculate de broglie wavelength associated with thermal neutron of temperature 27^0C. |
| Answer» Calculate de broglie wavelength associated with thermal neutron of temperature 27^0C. | |
| 24. |
(a) What is a magnetic field? How can the direction of magnetic field lines at a place be determined?(b) State the rule for the direction of the magnetic field produced around a current-carrying conductor. Draw a sketch of the pattern of field lines due to a current flowing through a straight conductor. |
|
Answer» (a) What is a magnetic field? How can the direction of magnetic field lines at a place be determined? (b) State the rule for the direction of the magnetic field produced around a current-carrying conductor. Draw a sketch of the pattern of field lines due to a current flowing through a straight conductor. |
|
| 25. |
Potential difference across a battery is 9V. On connecting a 24Ω resistor across the terminals of the battery, the voltmeter reads 7.2 V. Calculate the internal resistance of the battery. |
|
Answer» Potential difference across a battery is 9V. On connecting a 24Ω resistor across the terminals of the battery, the voltmeter reads 7.2 V. Calculate the internal resistance of the battery. |
|
| 26. |
74. a ball of mass 1 kg is fired horizontally with velocity 30 m/s from the top of a tower of height 80 m. Find the magnitude of linear momentum of ball when it hits the ground? |
| Answer» 74. a ball of mass 1 kg is fired horizontally with velocity 30 m/s from the top of a tower of height 80 m. Find the magnitude of linear momentum of ball when it hits the ground? | |
| 27. |
Pearls occur naturally in a variety of colours. How do the pearls get these colours? |
| Answer» Pearls occur naturally in a variety of colours. How do the pearls get these colours? | |
| 28. |
Construct the matrix for each of the following graphs.(i)(ii)(iii)(iv) |
|
Answer» Construct the matrix for each of the following graphs. (i)
(ii)
(iii)
(iv)
|
|
| 29. |
9. Two resistors of resistance 300 ohm and 600 ohm at 0degree celsius having thermal coefficient of resistance a and 3a respectively. If they are connected in parallel then equivalent thermal coefficient of resistance is |
| Answer» 9. Two resistors of resistance 300 ohm and 600 ohm at 0degree celsius having thermal coefficient of resistance a and 3a respectively. If they are connected in parallel then equivalent thermal coefficient of resistance is | |
| 30. |
23.An arrangement of 5 identical capacitors is shown in given circuit the potential at x and y are respectively |
| Answer» 23.An arrangement of 5 identical capacitors is shown in given circuit the potential at x and y are respectively | |
| 31. |
Question 12 In torches, search lights and headlights of vehicles the bulb is placed (a) between the pole and the focus of the reflector (b) very near to the focus of the reflector (c) between the focus and centre of curvature of the reflector (d) at the centre of curvature of the reflector |
|
Answer» Question 12 |
|
| 32. |
2. Three particles A, B and C each of mass m arethe comers of an equilateral triangle of sideL. If the particle A is released keeping the particlesand C fixed, the magnitude of instantaneousacceleration of A is |
| Answer» 2. Three particles A, B and C each of mass m arethe comers of an equilateral triangle of sideL. If the particle A is released keeping the particlesand C fixed, the magnitude of instantaneousacceleration of A is | |
| 33. |
When an object of height 3 cm is placed at a distance of 30 cm from a lens, a real image is formed at a distance of 60 cm. Find out the height of the image? |
|
Answer» When an object of height 3 cm is placed at a distance of 30 cm from a lens, a real image is formed at a distance of 60 cm. Find out the height of the image? |
|
| 34. |
The electrical particle which is responsible for the heating effect in the conductors is ______. |
|
Answer» The electrical particle which is responsible for the heating effect in the conductors is ______. |
|
| 35. |
State the principle of an electric generator. [2 MARKS] |
|
Answer» State the principle of an electric generator. [2 MARKS] |
|
| 36. |
How do kilowatt and kilowatt-hour differ? |
|
Answer» How do kilowatt and kilowatt-hour differ? |
|
| 37. |
how much positive and negative charge is there in a cup of water? |
| Answer» how much positive and negative charge is there in a cup of water? | |
| 38. |
Do alloys have high resistance or low resistance? Do alloys have high resistivity or low resistivity? |
|
Answer» Do alloys have high resistance or low resistance? Do alloys have high resistivity or low resistivity? |
|
| 39. |
A student performs an experiment to estimate the focal length of a convex lens by obtaining the image of a distant window on a white screen. The image formed on the white screen is :(1) virtual, erect and magnified(2) real, erect and magnified(3) real, inverted and diminished(4) virtual, inverted and diminished |
|
Answer» A student performs an experiment to estimate the focal length of a convex lens by obtaining the image of a distant window on a white screen. The image formed on the white screen is : (1) virtual, erect and magnified (2) real, erect and magnified (3) real, inverted and diminished (4) virtual, inverted and diminished |
|
| 40. |
Find the effective capacitance of the following system. Having a variable dielectric |
|
Answer» Find the effective capacitance of the following system. Having a variable dielectric |
|
| 41. |
for the hollow thin cylindrical current carrying pipe which statement is correct 1.magnetic field inside the pipe is not zero 2.magnetic field outside the pipe is zero 3.electric field outside the pipe is zero 4.electric field on the surface of pipe is |
| Answer» for the hollow thin cylindrical current carrying pipe which statement is correct 1.magnetic field inside the pipe is not zero 2.magnetic field outside the pipe is zero 3.electric field outside the pipe is zero 4.electric field on the surface of pipe is | |
| 42. |
When a wire is moved up and down in a magnetic field, a current is induced in the wire. What is this phenomenon known as ? |
|
Answer» When a wire is moved up and down in a magnetic field, a current is induced in the wire. What is this phenomenon known as ? |
|
| 43. |
1.Explain induced catalysis |
| Answer» 1.Explain induced catalysis | |
| 44. |
16.Light is incident from glass (RI 1.5) to air. Sketch the variation of deviation d with the angle of incidence ¡ for 0 |
| Answer» 16.Light is incident from glass (RI 1.5) to air. Sketch the variation of deviation d with the angle of incidence ¡ for 0 | |
| 45. |
Two sounds having same speed in a medium are having wavelengths 1.3 m and 3.9 m. A person listens to these sounds. What difference would the listener would feel? |
|
Answer» Two sounds having same speed in a medium are having wavelengths 1.3 m and 3.9 m. A person listens to these sounds. What difference would the listener would feel? |
|
| 46. |
Name state and explain with an example the rule used to determine the direction of force experienced by a current carrying conductor placed in a uniform magnetic field |
| Answer» Name state and explain with an example the rule used to determine the direction of force experienced by a current carrying conductor placed in a uniform magnetic field | |
| 47. |
If a current is passed through a loop of wire, as shown, how will the loop move? |
|
Answer» If a current is passed through a loop of wire, as shown, how will the loop move? |
|
| 48. |
how to do this wave curve method 4/(x-1)greater than equal to 1/(2x-1) |
| Answer» how to do this wave curve method 4/(x-1)greater than equal to 1/(2x-1) | |
| 49. |
The reading of the ammeter for a silicon diode in the given circuit is: |
|
Answer» The reading of the ammeter for a silicon diode in the given circuit is:
|
|
| 50. |
what is the difference between a solenoid and a coil ? and what is the similarity between a bar magnet and a solenoid ? |
| Answer» what is the difference between a solenoid and a coil ? and what is the similarity between a bar magnet and a solenoid ? | |
