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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. |
Column-I gives some devices and Column-II gives some processes on which the functioning of these devices depend. Match the devices in Column-I with the processes in Column-II and indicates your answer by darkening appropriate bubbles in the 4 × 4 matrix given in the ORS. Column-I Column-II (p) Bimetallic strip (a) Radiation from a hot body (q) Steam engine (b) Energy conversion (r) Incandescent lamp (c) Melting (s) Electric fuse (d) Thermal expansion of solids (IIT JEE 2007) |
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Answer» Column-I gives some devices and Column-II gives some processes on which the functioning of these devices depend. Match the devices in Column-I with the processes in Column-II and indicates your answer by darkening appropriate bubbles in the 4 × 4 matrix given in the ORS.
(IIT JEE 2007) |
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| 2. |
What do you understand by the term "electric potential" ? (or potential) at a point? What is the unit of electric potential? |
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Answer» What do you understand by the term "electric potential" ? (or potential) at a point? What is the unit of electric potential? |
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| 3. |
A uniform wire of resistance R stretched uniformly to n- times and then cut to form five wires of equal length, these wire are arranged as shown in the figure. The effective resistance between the point A and B is |
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Answer» A uniform wire of resistance R stretched uniformly to n- times and then cut to form five wires of equal length, these wire are arranged as shown in the figure. The effective resistance between the point A and B is |
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| 4. |
two positions of convex lens for which image of the object is formed on the same screen are 40 cm and 80 cm from the object. The focal length of the lens isa. 80/3b. 40/3c.40d.80 |
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Answer» two positions of convex lens for which image of the object is formed on the same screen are 40 cm and 80 cm from the object. The focal length of the lens is a. 80/3 b. 40/3 c.40 d.80 |
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| 5. |
What is the phenomenon responsible for the blue colour of the sky? |
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Answer» What is the phenomenon responsible for the blue colour of the sky? |
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| 6. |
10.Two point charges q1 and q2 |
| Answer» 10.Two point charges q1 and q2 | |
| 7. |
Why eye is at least strain when object is at infinity and why not the object is at 25 cm the eye are least strain |
| Answer» Why eye is at least strain when object is at infinity and why not the object is at 25 cm the eye are least strain | |
| 8. |
Heater of an electric kettle is made of a wire of length L and diameter d. It takes 4 minutes to raisethe temperature of 0.5 kg water by 40 K. This heater is replaced by a new heater having two wiresof the same material, cach of length L and diameter 2d. The way these wires are connected is givenin the options. How much time in minutes will it take to raise the temperature of the same amount ofwater by 40 K ?(A) 4 if wires are in parallel(C) 1 if wires are in series51.\lbrack JEE Advanced 2014\rbrack(B) 2 if wires are in series(D) 0.5 if wires are in parallel |
| Answer» Heater of an electric kettle is made of a wire of length L and diameter d. It takes 4 minutes to raisethe temperature of 0.5 kg water by 40 K. This heater is replaced by a new heater having two wiresof the same material, cach of length L and diameter 2d. The way these wires are connected is givenin the options. How much time in minutes will it take to raise the temperature of the same amount ofwater by 40 K ?(A) 4 if wires are in parallel(C) 1 if wires are in series51.\lbrack JEE Advanced 2014\rbrack(B) 2 if wires are in series(D) 0.5 if wires are in parallel | |
| 9. |
The de-Broglie wavelength of a neutron at 27∘C is λ. The de-Broglie wavelength of the neutron at 927∘C will be |
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Answer» The de-Broglie wavelength of a neutron at 27∘C is λ. The de-Broglie wavelength of the neutron at 927∘C will be |
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| 10. |
Question 8The major problem in harnessing nuclear energy is how to(a) split nuclei?(b) sustain the reaction?(c) dispose off spent fuel safely?(d) convert nuclear energy into electrical energy? |
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Answer» Question 8 |
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| 11. |
42.Explain relative mass bombardment of berylium with alpha to form neutron ( neutral particle) |
| Answer» 42.Explain relative mass bombardment of berylium with alpha to form neutron ( neutral particle) | |
| 12. |
{ An object is placed at a distance of }36cm from a }} convex mirror. A plane mirror is placed inbetween } so that the two virtual images so formed coincide. }{ If the plane mirror is at a distance of }24cm from }} the object, find the radius of curvature of convex } mirror. |
| Answer» { An object is placed at a distance of }36cm from a }} convex mirror. A plane mirror is placed inbetween } so that the two virtual images so formed coincide. }{ If the plane mirror is at a distance of }24cm from }} the object, find the radius of curvature of convex } mirror. | |
| 13. |
A steering wheel of diameter 0.5 m is rotated anticlockwise by applying two forces each of magnitude 5 N. Calculate the moment of couple applied. |
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Answer» A steering wheel of diameter 0.5 m is rotated anticlockwise by applying two forces each of magnitude 5 N. Calculate the moment of couple applied. |
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| 14. |
A pulley system has a velocity ratio 3 and an efficiency of 80%. Draw a labelled diagram of this pulley system. Calculate : (a) the mechanical advantage of the system, and (b) the effort required to raise a load of 300 N. |
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Answer» A pulley system has a velocity ratio 3 and an efficiency of 80%. Draw a labelled diagram of this pulley system. Calculate : (a) the mechanical advantage of the system, and (b) the effort required to raise a load of 300 N. |
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| 15. |
While doing the experiment to trace the path of light ray through a triangular glass prism, the, students are advised to take angle of incidence not less than 30 degree, because : (a) it becomes difficult to locate the position of object (pins). (b) three images of object are formed. (c) blurred image of object is formed. (d) image of object is not formed. |
| Answer» While doing the experiment to trace the path of light ray through a triangular glass prism, the, students are advised to take angle of incidence not less than 30 degree, because : (a) it becomes difficult to locate the position of object (pins). (b) three images of object are formed. (c) blurred image of object is formed. (d) image of object is not formed. | |
| 16. |
To an astronaut in a space -ship, the earth appears : (a) white (b) red (c) blue (d) black |
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Answer» To an astronaut in a space -ship, the earth appears : (a) white (b) red (c) blue (d) black |
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| 17. |
Explain why the bulb would not glow in the arrangement shown in figure below. |
Answer» Explain why the bulb would not glow in the arrangement shown in figure below. |
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| 18. |
a block of mass m=11.7 kg is to be pushed a distance of s= 4.65 m along an incline and raised to a distance of h=2.86 m. Assuming frictionless surface. Calculate the work done in applying a force parallel to the incline to push the block up at constant speed . ( Take ,g =9.8ms^-2) |
| Answer» a block of mass m=11.7 kg is to be pushed a distance of s= 4.65 m along an incline and raised to a distance of h=2.86 m. Assuming frictionless surface. Calculate the work done in applying a force parallel to the incline to push the block up at constant speed . ( Take ,g =9.8ms^-2) | |
| 19. |
What is a magnetic field? How can the direction of magnetic field lines at a place be determined ? |
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Answer» What is a magnetic field? How can the direction of magnetic field lines at a place be determined ? |
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| 20. |
An object is placed infront of a converging lens of focal length 20 cm. The distance of the object from the lens is 30 cm. Find the position of the image formed. |
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Answer» An object is placed infront of a converging lens of focal length 20 cm. The distance of the object from the lens is 30 cm. Find the position of the image formed. |
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| 21. |
A series L-R circuit is connected to a battery of emf V. If the circuit is switched on at t=0, then the time at which the energy stored in the inductor reaches (1n) times of its maximum value is |
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Answer» A series L-R circuit is connected to a battery of emf V. If the circuit is switched on at t=0, then the time at which the energy stored in the inductor reaches (1n) times of its maximum value is |
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| 22. |
Find the current in the circuit. |
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Answer» Find the current in the circuit. |
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| 23. |
How has the traditional use of wind energy been modified for our convenience ? |
| Answer» How has the traditional use of wind energy been modified for our convenience ? | |
| 24. |
76. What is the minimum distance between the object and final image if the focal length of convex lens is 20 cm? |
| Answer» 76. What is the minimum distance between the object and final image if the focal length of convex lens is 20 cm? | |
| 25. |
Given three liquid having temperature 50∘C, 52∘C and 56∘C. The specific heats of the three liquid are S, 2S and 3S, respectively. What will be the temperature of mixture, if each liquid is mixed in equal proportion of mass? |
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Answer» Given three liquid having temperature 50∘C, 52∘C and 56∘C. The specific heats of the three liquid are S, 2S and 3S, respectively. What will be the temperature of mixture, if each liquid is mixed in equal proportion of mass? |
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| 26. |
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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| 27. |
What happens when a real image is formed in front of a concave mirror if no screen is placed to capture it ? Is that image still visible? Also , what is a screen ? |
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Answer» What happens when a real image is formed in front of a concave mirror if no screen is placed to capture it ? Is that image still visible? Also , what is a screen ? |
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| 28. |
a) Define the EMF (ϵ) of a cell and the potential difference (V) across a resistor R in terms of the work done in moving a unit charge. b) State the relation between these two works and the work done in moving a unit charge through a cell connected across the resistor. Take the internal resistance of the cell of r. Hence, obtain an expression for the current (I) in the circuit. [5 MARKS] |
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Answer» a) Define the EMF (ϵ) of a cell and the potential difference (V) across a resistor R in terms of the work done in moving a unit charge. b) State the relation between these two works and the work done in moving a unit charge through a cell connected across the resistor. Take the internal resistance of the cell of r. Hence, obtain an expression for the current (I) in the circuit. [5 MARKS] |
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| 29. |
Two particle each of mass m and charge q are attached to the two ends of a light rigid rod of length 2R. The rod is rotated at constant angular speed about a perpendicular axis passing through its centre. The ratio of the magnitude of the magnetic moment of the system and its angular momentum about the centre of the rod |
| Answer» Two particle each of mass m and charge q are attached to the two ends of a light rigid rod of length 2R. The rod is rotated at constant angular speed about a perpendicular axis passing through its centre. The ratio of the magnitude of the magnetic moment of the system and its angular momentum about the centre of the rod | |
| 30. |
Composition of the nuclei of two atomic species, X and Y are given as under X YProtons = 6 6Neutrons = 6 8Give the mass numbers of X and Y. What is the relation between the two species? |
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Answer» Composition of the nuclei of two atomic species, X and Y are given as under |
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| 31. |
The diagram in the figure shows three ways in which the string of length l in an instrument can vibrate. (a) Which of the diagram shows the principal note? (b) Which vibration has the frequency four times that of the first? (c) Which vibration is of longest wavelength? (d) What is the ratio of frequency of vibrations in diagram (i) and (ii)? |
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Answer» The diagram in the figure shows three ways in which the string of length l in an instrument can vibrate.
(a) Which of the diagram shows the principal note? (b) Which vibration has the frequency four times that of the first? (c) Which vibration is of longest wavelength? (d) What is the ratio of frequency of vibrations in diagram (i) and (ii)? |
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| 32. |
A 0.5 solenoid has 500 turns and has a flux density of 2.5210 power -3 T at it's centre .find the current in the solenoid |
| Answer» A 0.5 solenoid has 500 turns and has a flux density of 2.5210 power -3 T at it's centre .find the current in the solenoid | |
| 33. |
two equal masses are placed at a dis†an cer from each other.where does the centre of mass |
| Answer» two equal masses are placed at a dis†an cer from each other.where does the centre of mass | |
| 34. |
What is displacement current? |
| Answer» What is displacement current? | |
| 35. |
An electric immersion heater of 1.08 kW is immersed in water. After it has reached a temperature of 100∘C , how much time will be require to produce 100 g of steam ? |
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Answer» An electric immersion heater of 1.08 kW is immersed in water. After it has reached a temperature of 100∘C , how much time will be require to produce 100 g of steam ? |
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| 36. |
10.Two point light sources are 24cm apart. Where should a convex lens of focal length 9cm be put in between them from one source so that the images of both sources are formed at the same place? A) 6cm B) 9cm C) 12cm D) 15cm |
| Answer» 10.Two point light sources are 24cm apart. Where should a convex lens of focal length 9cm be put in between them from one source so that the images of both sources are formed at the same place? A) 6cm B) 9cm C) 12cm D) 15cm | |
| 37. |
On the bombardment of a neutron with Boron. α-particle is emitted and product nuclei formed is |
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Answer» On the bombardment of a neutron with Boron. α-particle is emitted and product nuclei formed is |
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| 38. |
What happens to the specific heat capacity of water, if the quantity of water increases? |
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Answer» What happens to the specific heat capacity of water, if the quantity of water increases? |
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| 39. |
State whether the fission of uranium-235 is caused by low energy neutrons or high energy neutrons. |
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Answer» State whether the fission of uranium-235 is caused by low energy neutrons or high energy neutrons. |
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| 40. |
Information on Lasers |
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Answer» Information on Lasers |
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| 41. |
A ball is projected upward from a height h above the surface the earth with velocity v .The time at which the ball strikes the ground 1)v/g+2gh/2 2)v/g(1-1+2h/g) 3)v/g(1+1+2hg/v.v) 4)v/g(1+v.v+2g/h) |
| Answer» A ball is projected upward from a height h above the surface the earth with velocity v .The time at which the ball strikes the ground 1)v/g+2gh/2 2)v/g(1-1+2h/g) 3)v/g(1+1+2hg/v.v) 4)v/g(1+v.v+2g/h) | |
| 42. |
In the following circuit, the current through the resistor R(=2Ω) is I Amperes. The value of I is |
Answer» In the following circuit, the current through the resistor R(=2Ω) is I Amperes. The value of I is |
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| 43. |
Difference between magnetic dipole and magnetic moment |
| Answer» Difference between magnetic dipole and magnetic moment | |
| 44. |
what is limiting force |
| Answer» what is limiting force | |
| 45. |
What is the colour seen at the inner and outer edge of the rainbow respectively? |
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Answer» What is the colour seen at the inner and outer edge of the rainbow respectively? |
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| 46. |
Two wires are bent (shown as joint-circle) with radius r (in xy plane). The upper half has resistance of 2R Ω and the lower half of R Ω. A current I is passed into circle as shown. The magnetic field at centre is : |
| Answer» Two wires are bent (shown as joint-circle) with radius r (in xy plane). The upper half has resistance of 2R Ω and the lower half of R Ω. A current I is passed into circle as shown. The magnetic field at centre is : | |
| 47. |
light of wavelength 500nm is incident on a metal with work function 2.28eV . the de broglie wavelength of the emitted electron i |
| Answer» light of wavelength 500nm is incident on a metal with work function 2.28eV . the de broglie wavelength of the emitted electron i | |
| 48. |
Which of the types of radiation listed below has a wavelength shorter than that of visible light and can cause fluorescence? |
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Answer» Which of the types of radiation listed below has a wavelength shorter than that of visible light and can cause fluorescence? |
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| 49. |
if two bulbs of power 60 W and 100 W respectively each rated 110 V are connected in series with supply of 220 V then 1)60 W bulb will fuse 2)100 W bulb will fuse 3)both bulb will fuse 4)bulb will not fuse |
| Answer» if two bulbs of power 60 W and 100 W respectively each rated 110 V are connected in series with supply of 220 V then 1)60 W bulb will fuse 2)100 W bulb will fuse 3)both bulb will fuse 4)bulb will not fuse | |
| 50. |
Consider the following objects and state with a brief explanation the class of lever each belongs to: Nail cutter Knife Forceps |
Answer» Consider the following objects and state with a brief explanation the class of lever each belongs to:
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