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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. |
Question 10 In our country, vast tracts of forests are cleared and a single species of plant is cultivated. This practice promotes (a) biodiversity in the area (b) monoculture in the area (c) growth of natural forest (d) preserves the natural ecosystem in the area |
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Answer» Question 10 In our country, vast tracts of forests are cleared and a single species of plant is cultivated. This practice promotes (a) biodiversity in the area (b) monoculture in the area (c) growth of natural forest (d) preserves the natural ecosystem in the area |
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| 2. |
The emf of a storage battery is 90 V before charging and 100 V after charging. When the charging began the current was 10 A. What is the current at the end of charging if the internal resistance of the storage battery during the process of charging may be taken as constant and equal to 2 Ω?Assume the voltage of the charging point to be constant. |
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Answer» The emf of a storage battery is 90 V before charging and 100 V after charging. When the charging began the current was 10 A. What is the current at the end of charging if the internal resistance of the storage battery during the process of charging may be taken as constant and equal to 2 Ω? |
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| 3. |
How come velocity of the sound is inversely proportional to the square root of density? We know that sound speed increase in an increase in density. Explain |
| Answer» How come velocity of the sound is inversely proportional to the square root of density? We know that sound speed increase in an increase in density. Explain | |
| 4. |
Polarity of magnetic filed of a solenoid carrying current |
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Answer» Polarity of magnetic filed of a solenoid carrying current |
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| 5. |
where will be the centre of mass of a system containing two point masses of mass 2kg and 5kg lie? and why? |
| Answer» where will be the centre of mass of a system containing two point masses of mass 2kg and 5kg lie? and why? | |
| 6. |
Question 18 (c) Explain: (c) Why is the series arrangement not used for domestic circuits? |
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Answer» Question 18 (c) Explain: (c) Why is the series arrangement not used for domestic circuits? |
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| 7. |
Is current a scaler or vector quantity.Why and why not? |
| Answer» Is current a scaler or vector quantity.Why and why not? | |
| 8. |
If A’ is the image of A then the light ray going from B and hitting the mirror at C will intersect the principal axis at which point? |
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Answer» If A’ is the image of A then the light ray going from B and hitting the mirror at C will intersect the principal axis at which point? |
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| 9. |
Ques: A drop of mercury of radius 'R' is split into 'N' identical droplets.Calculate the Surface energy released. (Given 'S' is the surface tension). |
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Answer» Ques: A drop of mercury of radius 'R' is split into 'N' identical droplets. Calculate the Surface energy released. (Given 'S' is the surface tension). |
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| 10. |
The appliance which works on the principle of moments is |
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Answer» The appliance which works on the principle of moments is |
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| 11. |
46. If refractive index of water is 1.33, then calculate the speed of light in water? |
| Answer» 46. If refractive index of water is 1.33, then calculate the speed of light in water? | |
| 12. |
The kinetic energy of a body is increased by 300%.Find the percentage change in its momentum. |
| Answer» The kinetic energy of a body is increased by 300%.Find the percentage change in its momentum. | |
| 13. |
(a) In a H.P, find T19(b) In a H.P, find T7 and T12 |
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Answer» (a) In a H.P, (b) In a H.P, |
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| 14. |
Choose which of the following options are correct. |
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Answer» Choose which of the following options are correct. |
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| 15. |
Why are investors reluctant to invest in tidal energy projects? |
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Answer» Why are investors reluctant to invest in tidal energy projects? |
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| 16. |
Why does it take some time to see objects in a dim room when you enter the room from bright sunshine outside ? |
| Answer» Why does it take some time to see objects in a dim room when you enter the room from bright sunshine outside ? | |
| 17. |
Arrangement shown below is used to measure the power of a rotating shaft having 25 revolutions per second. If the spring opposing force as measured on the scale was found to be 105 N then the power consumed by the shaft in kW is ____.4.71 |
Answer» Arrangement shown below is used to measure the power of a rotating shaft having 25 revolutions per second. If the spring opposing force as measured on the scale was found to be 105 N then the power consumed by the shaft in kW is ____.
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| 18. |
bacterial growth30) A special gas mixture used inchamber contains 1% by weight of CO, and ggoof O. What is the partial pressuregas at a total pressure of 0.977 atmEL(in atm) of each |
| Answer» bacterial growth30) A special gas mixture used inchamber contains 1% by weight of CO, and ggoof O. What is the partial pressuregas at a total pressure of 0.977 atmEL(in atm) of each | |
| 19. |
A screw gauge was found to have a pitch equal to 0.8 mm. What should be the number of divisions on its head so that you can read up to 0.001 cm using this? |
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Answer» A screw gauge was found to have a pitch equal to 0.8 mm. What should be the number of divisions on its head so that you can read up to 0.001 cm using this? |
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| 20. |
Define the term focal length of a lens. |
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Answer» Define the term focal length of a lens. |
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| 21. |
Find out position of image and also size and nature of image in following cases and draw ray diagrams for each of the cases:- (1). CONCAVE LENS f=10 cm object distance= 10cm (2). CONCAVE MIRROR f=20cm height of object=400cm distance of object =10 cm (3). CONVEX LENS P=2D object distance= 20 cm (4). CONVEX MIRROR f=40 cm object size= 2cm object distance = 40cm |
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Answer» Find out position of image and also size and nature of image in following cases and draw ray diagrams for each of the cases:- (1). CONCAVE LENS f=10 cm object distance= 10cm (2). CONCAVE MIRROR f=20cm height of object=400cm distance of object =10 cm (3). CONVEX LENS P=2D object distance= 20 cm (4). CONVEX MIRROR f=40 cm object size= 2cm object distance = 40cm |
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| 22. |
A person uses lens of +3D to normalise vision .Near pt. of hypermetropic eyes is? |
| Answer» A person uses lens of +3D to normalise vision .Near pt. of hypermetropic eyes is? | |
| 23. |
3) decreaseAn a-particle moves in a circular path of radius0.83 cm in the presence of a magnetic field of0.25 Wb/m2. The de Broglie wavelength associatedwith the particle will be:(1) 10(2) 0.1A(4) 0.01(3) 1Arrnct statement is : |
| Answer» 3) decreaseAn a-particle moves in a circular path of radius0.83 cm in the presence of a magnetic field of0.25 Wb/m2. The de Broglie wavelength associatedwith the particle will be:(1) 10(2) 0.1A(4) 0.01(3) 1Arrnct statement is : | |
| 24. |
We feel fresh while on a morning walk in natural surroundings. Why don’t we feel the same after 10 a.m and during rush hours? Write a chemical reaction to support your statement. |
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Answer» We feel fresh while on a morning walk in natural surroundings. Why don’t we feel the same after 10 a.m and during rush hours? Write a chemical reaction to support your statement. |
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| 25. |
List the names of three electical gadgets used n your house. Write their power, voltage rating and approximate time for which each one is used in a day. Hence find the electrical energy consumed by each in a month of 30 days. |
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Answer» List the names of three electical gadgets used n your house. Write their power, voltage rating and approximate time for which each one is used in a day. Hence find the electrical energy consumed by each in a month of 30 days. |
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| 26. |
An electric geyser has the ratings 2000 W, 220 V marked on it. What should be the minimum rating, in whole number, of a fuse wire that may be required for safe use with this geyser? |
| Answer» An electric geyser has the ratings 2000 W, 220 V marked on it. What should be the minimum rating, in whole number, of a fuse wire that may be required for safe use with this geyser? | |
| 27. |
(a) An electric iron is rated at 230 V, 750 W. Calculate (i) the maximum current, and (ii) the number of units of electricity it would use in 30 minutes. (b) Which of the following fuse ratings would be suitable for electric iron ? 1 A, 3 A, 5 A, 13 A |
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Answer» (a) An electric iron is rated at 230 V, 750 W. Calculate (i) the maximum current, and (ii) the number of units of electricity it would use in 30 minutes. (b) Which of the following fuse ratings would be suitable for electric iron ? 1 A, 3 A, 5 A, 13 A |
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| 28. |
The angular displacement of a particle wrt time is given by theta=3t2-4t+3. If the particle is moving on a circular path of radius 1m, then at 1s,a. Total acceleration of the particle is 10m/s2b. Tangential acceleration is 4m/s2c. Radial acceleration is 4m/s2d. Magnitude of linear velocity is 6m/s |
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Answer» The angular displacement of a particle wrt time is given by theta=3t2-4t+3. If the particle is moving on a circular path of radius 1m, then at 1s, a. Total acceleration of the particle is 10m/s2 b. Tangential acceleration is 4m/s2 c. Radial acceleration is 4m/s2 d. Magnitude of linear velocity is 6m/s |
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| 29. |
A copper calorimeter of mass 100g contains 150g of water and 10g of ice in thermal equilibrium at atmospheric pressure. A piece of lead of mass 100g at 200°C is dropped into calorimeter . Find the final temperature (assume no heat is lost to the surrounding) and the amount of ice left. (Take L=335 kJ/kg), if required. |
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Answer» A copper calorimeter of mass 100g contains 150g of water and 10g of ice in thermal equilibrium at atmospheric pressure. A piece of lead of mass 100g at 200°C is dropped into calorimeter . Find the final temperature (assume no heat is lost to the surrounding) and the amount of ice left. (Take L=335 kJ/kg), if required. |
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| 30. |
One electron volt is related to the SI unit of energy as |
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Answer» One electron volt is related to the SI unit of energy as |
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| 31. |
A resistor of magnitude 45 ohm is connected to an electric cell of EMF 12 volt and of 3 ohm internal resistance. an ammeter of resistance 45 ohm and a voltmeter of resistance 405 ohm are properly connected with the resistor.what percentage errors in finding current and potential difference will occur? |
| Answer» A resistor of magnitude 45 ohm is connected to an electric cell of EMF 12 volt and of 3 ohm internal resistance. an ammeter of resistance 45 ohm and a voltmeter of resistance 405 ohm are properly connected with the resistor.what percentage errors in finding current and potential difference will occur? | |
| 32. |
What is the speed of light in vacuum? Mention a condition in which the speed of light changes. |
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Answer» What is the speed of light in vacuum? Mention a condition in which the speed of light changes. |
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| 33. |
Why are the poles of the magnet used in Generator is made concave? |
| Answer» Why are the poles of the magnet used in Generator is made concave? | |
| 34. |
98.The resistances 'R1' and 'R2' are connected in parallel.The equivalent resistance of the combination is what? |
| Answer» 98.The resistances 'R1' and 'R2' are connected in parallel.The equivalent resistance of the combination is what? | |
| 35. |
For CrCl3. xNH3 elevation in boiling point of 1 molal solution is double of 1 molal solution of glucose ; if complex is 100 % ionised |
| Answer» For CrCl3. xNH3 elevation in boiling point of 1 molal solution is double of 1 molal solution of glucose ; if complex is 100 % ionised | |
| 36. |
An elastic circular wire of length l carries a current I. It is placed in a uniform magnetic field B (Out of paper) such that its plane is perpendicular to the direction of B. The wire will experience |
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Answer» An elastic circular wire of length l carries a current I. It is placed in a uniform magnetic field B (Out of paper) such that its plane is perpendicular to the direction of B. The wire will experience |
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| 37. |
48. A planoconvex lens is silvered on its plane side and it acts as a concave mirror of focal length 20 cm.When the convex side is silvered it acts as a concave mirror of focal length 7 cm.Calculate the refractive index of the lens material. |
| Answer» 48. A planoconvex lens is silvered on its plane side and it acts as a concave mirror of focal length 20 cm.When the convex side is silvered it acts as a concave mirror of focal length 7 cm.Calculate the refractive index of the lens material. | |
| 38. |
An image formed on a screen is three times the size of the object. The object and screen are 80 cm apart when the image is sharply focused. (a) State which type of lens is used. (b) Calculate the focal length of the lens. |
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Answer» An image formed on a screen is three times the size of the object. The object and screen are 80 cm apart when the image is sharply focused. (a) State which type of lens is used. (b) Calculate the focal length of the lens. |
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| 39. |
The same mass of aluminium is drawn into wires 1mm and 2mm thick two wires are connected in series and current is passed through them heat produced in the wire is in the ratio |
| Answer» The same mass of aluminium is drawn into wires 1mm and 2mm thick two wires are connected in series and current is passed through them heat produced in the wire is in the ratio | |
| 40. |
Why bio-gas is also termed as gobar gas? |
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Answer» Why bio-gas is also termed as gobar gas? |
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| 41. |
Find the current through the 10 Ω resistor shown in figure. |
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Answer» Find the current through the 10 Ω resistor shown in figure. |
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| 42. |
21.What is meant by momentum??explain by practical mode |
| Answer» 21.What is meant by momentum??explain by practical mode | |
| 43. |
By reducing the amplitude of a sound wave, its: (a) pitch increases (b) loudness decreases (c) loudness increases (d) pitch decreases. |
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Answer» By reducing the amplitude of a sound wave, its: (a) pitch increases (b) loudness decreases (c) loudness increases (d) pitch decreases. |
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| 44. |
An object 4cm high is placed at a distance of 20cm from a concave mirror of focal length 8cm. By choosing a suitable scale draw a neat ray diagram and calculate the position and size of the image. Also state its characteristics. |
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Answer» An object 4cm high is placed at a distance of 20cm from a concave mirror of focal length 8cm. By choosing a suitable scale draw a neat ray diagram and calculate the position and size of the image. Also state its characteristics. |
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| 45. |
Question 1 (b)Judge the equivalent resistance when the following are connected in parallel – (b) 1Ω, 103Ω and 106Ω. |
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Answer» Question 1 (b) |
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| 46. |
The value of solar constant is |
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Answer» The value of solar constant is |
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| 47. |
an L-R circuit is connected to an AC source of 50 V(rms) and frequency 50 Hz. If the power consumed in the resistor is 150 W and the wattless component of the current is 4 A, then the voltage(rms) across the inductor will be : a-10 V b-20 V c-30 V d-40 V |
| Answer» an L-R circuit is connected to an AC source of 50 V(rms) and frequency 50 Hz. If the power consumed in the resistor is 150 W and the wattless component of the current is 4 A, then the voltage(rms) across the inductor will be : a-10 V b-20 V c-30 V d-40 V | |
| 48. |
Image is formed for the shortsighted person: |
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Answer» Image is formed for the shortsighted person: |
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| 49. |
explain point object |
| Answer» explain point object | |
| 50. |
A tuning fork of frequency 200 Hz is vibrating with a sonometer wire to produce 10 beats/sec. When the tension in the sonometer wire is increased, beat frequency decreases. Original frequency of the sonometer wire in Hz is |
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Answer» A tuning fork of frequency 200 Hz is vibrating with a sonometer wire to produce 10 beats/sec. When the tension in the sonometer wire is increased, beat frequency decreases. Original frequency of the sonometer wire in Hz is |
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find T19
find T7 and T12
