InterviewSolution
Saved Bookmarks
InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 16451. |
Study the diagram below. (i) Name the lens LL'. (ii) What are the points O and O' called ? (iii) Complete the diagram to form the image of the object AB. (iv) State three characteristics of the image. |
|
Answer» Study the diagram below.
(i) Name the lens LL'. (ii) What are the points O and O' called ? (iii) Complete the diagram to form the image of the object AB. (iv) State three characteristics of the image. |
|
| 16452. |
A ray of monochromatic light enters a liquid from air as shown in the diagram given below. The two angles on the surface of separation of liquid and air, when the ray of light moves out from the liquid to air is : |
|
Answer» A ray of monochromatic light enters a liquid from air as shown in the diagram given below. The two angles on the surface of separation of liquid and air, when the ray of light moves out from the liquid to air is : |
|
| 16453. |
A charged particle moves in a clockwise direction in a magnetic field which is perpendicular to the plane of paper directed downwards. What is the nature of charged particle ? |
|
Answer» A charged particle moves in a clockwise direction in a magnetic field which is perpendicular to the plane of paper directed downwards. What is the nature of charged particle ? |
|
| 16454. |
Why home appliances are connected in parallel combination ? |
|
Answer» Why home appliances are connected in parallel combination ? |
|
| 16455. |
why filament of a bulb should be thermally isolated |
| Answer» why filament of a bulb should be thermally isolated | |
| 16456. |
Which of the following weakens the case for TRAPPIST-1 as the one system with life? |
|
Answer» Which of the following weakens the case for TRAPPIST-1 as the one system with life? |
|
| 16457. |
What is stability of atoms |
|
Answer» What is stability of atoms |
|
| 16458. |
Find out the appropriate word which fits the 9th blank. |
|
Answer» Find out the appropriate word which fits the 9th blank. |
|
| 16459. |
An electric bulb rated 220 V, 60 W is working at full efficiency. Another identical bulb is connected in series with the first one and the system is connected across the mains as shown in the diagram: The total power of the bulbs is: |
|
Answer» An electric bulb rated 220 V, 60 W is working at full efficiency. Another identical bulb is connected in series with the first one and the system is connected across the mains as shown in the diagram:
The total power of the bulbs is: |
|
| 16460. |
A concave lens forms the image of an object kept at a distance 20 cm in front of it, at a distance 10 cm on the side of the object. (a) What is the nature of the image ? (b) Find the focal length of the lens. |
|
Answer» A concave lens forms the image of an object kept at a distance 20 cm in front of it, at a distance 10 cm on the side of the object. (a) What is the nature of the image ? (b) Find the focal length of the lens. |
|
| 16461. |
It is dangerous to connect the switch in the neutral wire. Explain your answer. |
|
Answer» It is dangerous to connect the switch in the neutral wire. Explain your answer. |
|
| 16462. |
Draw a diagram to show how a converging lens held close to the eye acts as a magnifying glass. Why is it usual to choose a lens of short focal length for this purpose rather than one of long focal length ? |
|
Answer» Draw a diagram to show how a converging lens held close to the eye acts as a magnifying glass. Why is it usual to choose a lens of short focal length for this purpose rather than one of long focal length ? |
|
| 16463. |
AB is an object, A'B' is an image formed. |
|
Answer» AB is an object, A'B' is an image formed.
|
|
| 16464. |
Find the focal length of a concave mirror whose radius of curvature is 32 cm. |
|
Answer» Find the focal length of a concave mirror whose radius of curvature is 32 cm. |
|
| 16465. |
A body of mass 10 kg is moving with velocity 4 m/s. If P is the momentum associated with the body and K.E. is the kinetic energy. Then K.E. and P of the body are: |
|
Answer» A body of mass 10 kg is moving with velocity 4 m/s. If P is the momentum associated with the body and K.E. is the kinetic energy. Then K.E. and P of the body are: |
|
| 16466. |
How is the mechanical advantage related with the velocity ratio for an actual machine ? State whether the efficiency of such a machine is equal to 1, less than 1 or more than 1. |
|
Answer» How is the mechanical advantage related with the velocity ratio for an actual machine ? State whether the efficiency of such a machine is equal to 1, less than 1 or more than 1. |
|
| 16467. |
Explain why strings of different thicknesses are provided on a stringed instrument. |
|
Answer» Explain why strings of different thicknesses are provided on a stringed instrument. |
|
| 16468. |
A 4 cm tall object is placed on the principal axis of convex lens. The distance of the object from the optical centre of the lens is 12 cm and its sharp image is formed at a distance of 24 cm from it on a screen on the other side of the lens. If the object is now moved a little away from the lens, in which way (towards the lens or away from the lens) will he have to move the screen to get a sharp image of the object on it again ? How will the magnification of the image be affected? |
| Answer» A 4 cm tall object is placed on the principal axis of convex lens. The distance of the object from the optical centre of the lens is 12 cm and its sharp image is formed at a distance of 24 cm from it on a screen on the other side of the lens. If the object is now moved a little away from the lens, in which way (towards the lens or away from the lens) will he have to move the screen to get a sharp image of the object on it again ? How will the magnification of the image be affected? | |
| 16469. |
Write the energy conversion that takes place in a hydropower plant. |
| Answer» Write the energy conversion that takes place in a hydropower plant. | |
| 16470. |
Which part of the solar cooker is responsible for greenhouse effect? |
|
Answer» Which part of the solar cooker is responsible for greenhouse effect? |
|
| 16471. |
The wavelength of X-rays is 0.01 ∘A. Calculate its frequency. State the assumption made, if any. |
|
Answer» The wavelength of X-rays is 0.01 ∘A. Calculate its frequency. State the assumption made, if any. |
|
| 16472. |
Imagine a light planet revolving around a very massive star in a circular orbit of radius R with a period of revolution T. If the gravitational force of attraction between planet and star is proportional to R−52, then T2 is proportional to |
|
Answer» Imagine a light planet revolving around a very massive star in a circular orbit of radius R with a period of revolution T. If the gravitational force of attraction between planet and star is proportional to R−52, then T2 is proportional to |
|
| 16473. |
Calculate the mechanical advantage of a lever whose input arm is 80 cm long and the output arm is 5 cm long. |
|
Answer» Calculate the mechanical advantage of a lever whose input arm is 80 cm long and the output arm is 5 cm long. |
|
| 16474. |
Why we take Red, Blue, Green as primary colours we can make any colour by combination of any three colours so why we take Red,blue,green as primary colour |
| Answer» Why we take Red, Blue, Green as primary colours we can make any colour by combination of any three colours so why we take Red,blue,green as primary colour | |
| 16475. |
Give an example of how diffused reflection can be useful. |
| Answer» Give an example of how diffused reflection can be useful. | |
| 16476. |
A stretch wire 0.4m long is made ot vibrate in two different modes as shown. What is the wavelenght of wave in i) mode P ii) mode Q and iii) IN which case the note is of higher pitch |
|
Answer» A stretch wire 0.4m long is made ot vibrate in two different modes as shown. What is the wavelenght of wave in i) mode P ii) mode Q and iii) IN which case the note is of higher pitch |
|
| 16477. |
The power of a lens is + 0.2 D. Calculate its focal length. |
|
Answer» The power of a lens is + 0.2 D. Calculate its focal length. |
|
| 16478. |
A lens has a focal length of, -10 cm. What is the power of the lens and what is its nature? |
|
Answer» A lens has a focal length of, -10 cm. What is the power of the lens and what is its nature? |
|
| 16479. |
Why do we need two eyes not a one eye? |
| Answer» Why do we need two eyes not a one eye? | |
| 16480. |
Which of the following is/are NOT true about the parallel connection? |
|
Answer» Which of the following is/are NOT true about the parallel connection? |
|
| 16481. |
A 6 kg mass moving with a velocity of 20 ms−1 collides with another 2 kg mass moving in opposite direction with a velocity of 10 ms−1. The momentum of system is. |
|
Answer» A 6 kg mass moving with a velocity of 20 ms−1 collides with another 2 kg mass moving in opposite direction with a velocity of 10 ms−1. The momentum of system is |
|
| 16482. |
When a fork is seen through lenses A and B one by one, it appears as shown in the diagrams. What is the nature of (i) lens A, and (ii) lens B ? Give reason for your answer. |
|
Answer» When a fork is seen through lenses A and B one by one, it appears as shown in the diagrams. What is the nature of (i) lens A, and (ii) lens B ? Give reason for your answer.
|
|
| 16483. |
Explain why, in a nuclear reactor, the chain reaction stops if the control rods re fully inserted into the graphite. |
| Answer» Explain why, in a nuclear reactor, the chain reaction stops if the control rods re fully inserted into the graphite. | |
| 16484. |
(a) Find the position and size of the virtual image formed when an object 2 cm tall is placed 20 cm from : (i) a diverging lens of focal length 40 cm. (ii) a converging lens of focal length 40 cm. (b) Draw labelled ray diagrams to show the formation of images in cases (i) and (ii) above (The diagrams may not be according to scale). |
|
Answer» (a) Find the position and size of the virtual image formed when an object 2 cm tall is placed 20 cm from : (i) a diverging lens of focal length 40 cm. (ii) a converging lens of focal length 40 cm. (b) Draw labelled ray diagrams to show the formation of images in cases (i) and (ii) above (The diagrams may not be according to scale). |
|
| 16485. |
When sunlight is concentrated on a piece of paper by a spherical mirror or lens, then a hole can be burnt in it. For doing this, the paper must be placed at the focus of : (a) either a convex mirror or convex lens (b) either a concave mirror or concave lens (c) either a concave mirror or convex lens (d) either a convex mirror or concave lens |
|
Answer» When sunlight is concentrated on a piece of paper by a spherical mirror or lens, then a hole can be burnt in it. For doing this, the paper must be placed at the focus of : (a) either a convex mirror or convex lens (b) either a concave mirror or concave lens (c) either a concave mirror or convex lens (d) either a convex mirror or concave lens |
|
| 16486. |
A coil of insulated copper wire is connected to a galvanometer. What would happen if a bar magnet is: (i) Pushed into the coil (ii) Withdrawn from inside the coil (iii) Held stationary inside the coil |
|
Answer» A coil of insulated copper wire is connected to a galvanometer. What would happen if a bar magnet is: (i) Pushed into the coil (ii) Withdrawn from inside the coil (iii) Held stationary inside the coil |
|
| 16487. |
Two bodies with kinetic energy in the ratio of 4 : 1 are moving with equal linear momentum. The ratio of their masses is |
|
Answer» Two bodies with kinetic energy in the ratio of 4 : 1 are moving with equal linear momentum. The ratio of their masses is |
|
| 16488. |
Two resistors of resistance 4 Ω and 6 Ω are connected in parallel to a cell to draw current 0.5 A from the cell. (a) Draw a labelled diagram of the arrangement. (b) Calculate the current in each resistor. |
|
Answer» Two resistors of resistance 4 Ω and 6 Ω are connected in parallel to a cell to draw current 0.5 A from the cell. |
|
| 16489. |
Alongwith live wire and neutral wire, a third wire is also used in domestic electric wiring. What name is given to this third wire ? |
|
Answer» Alongwith live wire and neutral wire, a third wire is also used in domestic electric wiring. What name is given to this third wire ? |
|
| 16490. |
Define the term power. State its S.I. unit. |
|
Answer» Define the term power. State its S.I. unit. |
|
| 16491. |
Question 14 Expand the abbreviation GAP |
|
Answer» Question 14 Expand the abbreviation GAP |
|
| 16492. |
What is Electrical generator? |
|
Answer» What is Electrical generator? |
|
| 16493. |
Use the mirror equation to deduce that an object placed between f and 2f of a concave mirror produces a real image beyond 2f. |
| Answer» Use the mirror equation to deduce that an object placed between f and 2f of a concave mirror produces a real image beyond 2f. | |
| 16494. |
A ray of light incident at 60° on a glass-air interface,then a light ray will |
|
Answer» A ray of light incident at 60° on a glass-air interface,then a light ray will |
|
| 16495. |
Where does object and the image coincide in a concave mirror |
|
Answer» Where does object and the image coincide in a concave mirror |
|
| 16496. |
What are the methods for minimising resonance?? |
|
Answer» What are the methods for minimising resonance?? |
|
| 16497. |
How to define electric potential? |
| Answer» How to define electric potential? | |
| 16498. |
50 g of a certain metal at 150∘C is immersed in 100 g of water at 11∘C. The final temperature is 20∘C. Find the specific heat capacity of the metal. Specific heat capacity of water is 4.2 Jg−1 K−1).0.582 |
|
Answer» 50 g of a certain metal at 150∘C is immersed in 100 g of water at 11∘C. The final temperature is 20∘C. Find the specific heat capacity of the metal. Specific heat capacity of water is 4.2 Jg−1 K−1).
|
|
| 16499. |
An endoscope is employed by a physician to view the internal parts of a body organ. It is based on the principle of: |
|
Answer» An endoscope is employed by a physician to view the internal parts of a body organ. It is based on the principle of: |
|
| 16500. |
Negative sign in answer does not mean a wrong answer. It indicates that current are in opposite direction to assumed direction. |
|
Answer» Negative sign in answer does not mean a wrong answer. It indicates that current are in opposite direction to assumed direction. |
|
