# CBSE Class 10 Physics Important Questions

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## Important Very Short Answer Type Questions (1 Marks)

The most important thing required for CBSE class 10 board exam preparation is the regular practise and assessment in Mathematics and Science. Because they are comparatively tricky but scoring at the same time. Hence, practise is the sole key to surpass in these subjects with excellent marks in CBSE class 10 board exam. In this section, SpeedLabs provides important questions for Physics. Its education experts have selected the questions for the benefit of the students who are appearing in the upcoming board exams conducted by CBSE. Since, there is no shortcut to success, just stay focus and assess your preparation with CBSE class 10 Physics important question.

Sections

Important Very Short Answer Type Questions (1 Marks)

Important Short Answer Type Questions (2 Marks)

Important Short Answer Type Questions (3 marks)

## Important Very Short Answer Type Questions (1 Marks) Stroke 396

• 1. What are the two types of electric charges?
• 2. What do you understand by potential difference?
• 3. The direction of current is the same as that of the flow of electrons. Explain with a circuit diagram. Is this statement true or false?
• 4. Define One Ohm
• 5. Name the mirror which can show the size of the object to be double of its original.
• 6. What is the magnification of a plane mirror
• 7. What is the radius of curvature of plane mirror?
• 8. Why paper catches fire when a convex lens is used to focus sunlight?
• 9. What is silvering of mirror?
• 10. Name the lens which converging the light
• 11. What kind of mirrors are used in big shopping stores to watch activities of customers?
• 12. Name the transparent membrane through which light enters the first in the eyes.
• 13. What is the function of iris?
• 14. What is persistence of vision?
• 15. What is Tyndall effect?
• 16. The image formed on retina is inverted but we can see the objects erect. Why?
• 17. Name the type of current:
• (a) used in household supply.
• (b) given by a cell
• 18. Give one application of electromagnetic induction.
• 19. A positively charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is
• (a) towards north
• (b) towards east
• (c) downward
• (d) upward
• 20. Name any two fossil fuels
• 21. Name the part of a biogas plant where reactions take place in the absence of oxygen
• 22. Name the kind of energy possessed by wind and the device used to harness it.
• 23. A black surface absorbs more heat radiations as compared to a white or a reflecting surface under identical conditions. List two solar devices which make use of this property in their design.

## Important Short Answer Type Questions (2 Marks)

• 1. What is electrical power? Write its unit.
• 2. Name the unit of (a) electrical resistance (b) resistivity
• 3. Determine the direction of conventional current?
• 4. What is electrical power? Write its unit.
• 5. Calculate the resistance of 2 km long copper wire of radius 2 mm. (Resistivity of copper = 1.72 x 1 0-8)
• 6. What is resistance of conductors? Name two metals which are highly resistant.0-8)
• 7. Why is tungsten metal used in bulbs but not in fuse wires?
• 8. What are the properties of the image formed by plane mirror
• 9. If the speed of light in water is 2.25X108m/s and the speed in vaccum is 3X108 m/s . Calculate the refractive index of water.
• 10. Find the focal length of a lens of power -2.0 D. what type of lens is this?
• 11. Give mirror image of word AMBULANCE
• 12. What is a diameter of human eye?
• 13. What is the function of crystalline lens of human eye?
• 14. In which type of eye defect far point of the eye gets reduced?
• 15. Why do birds fly back to their nest in the evening?
• 16. With the help of a labeled diagram, explain why the sun appears reddish at the sun-rise and the sunset.
• 17. Why and when does a current carrying conductor kept in a magnetic field experience force? List the factors on which direction of this force depends?
• 18. Explain any two situations that can cause electrical hazards in domestic circuits.
• 19. List in tabular form two major differences between an electric motor and a generator.
• 20. List two non-conventional sources of energy.
• 21. Define fuel. List any two characteristics that you would look for in a good fuel.
• 22. State any three reasons to justify that LPG is considered as an ideal fuel.
• 23. Sate any two advantages of charcoal over wood.

## Important Short Answer Type Questions (3 marks)

Question numbers 6 to 15 in Section- A are three marks questions. These are to be answered in about 50 words each.

• A wire is 1m long, 0.2mm in diameter and has resistance of 10Ω. Calculate its resistivity.
• Calculate the area of cross section of a wire of length 2m, its resistance is 25Ω and the resistivity of material of wire is 1.84×〖10〗^(-6) Ωm.
• Calculate the energy consumed by 120W toaster in 20 minutes.
• Define parallel connection and series connection.
• What are the disadvantages of heating effect of current? And What are the advantages of heating effect of current?
• A 250 watt electric bulb is lighted for 5 hours daily and four 6 watt bulbs are lighted for 4.5 hours daily. Calculate the energy consumed (in kWh) in the month of February.
• On what factors do the resistance of a conductor depend?
• Draw a ray diagram to show the path of the reflected ray corresponding to an incident ray which is directed parallel to the principal axis of a convex mirror. Mark on it the angle of incident and the angle of reflection
• A student cannot see a chart hanging on a wall placed at a distance of 3 m from him. Name the defect of vision he is suffering from. How can it be corrected? (CBSE 2012)Draw ray diagrams for the (i) defect of vision and also (ii) for its correction Why is red color selected for danger signal lights?
• (a) A person cannot read newspaper placed nearer than 50 cm from his eyes. Name the defect of vision he is suffering from. Draw a ray diagram to illustrate this defect. List its two possible causes. Draw a ray diagram to show how this defect may be corrected using a lens of appropriate focal length.
• Explain giving reason why the sky appears blue to an observer from the surface of the earth? What will the color of the sky be for an astronaut staying in the international space station orbiting the earth? Justify your answer giving reason.
• (a) List three common refractive defects of vision. Suggest the way of correcting these defects.
• (b) About 45 lac people in the developing countries are suffering from corneal blindness. About 30 lac children below the age of 12 years suffering from this defect can be cured by replacing the defective cornea with the cornea of a donated eye. How and why can students of your age involve themselves to create awareness about this fact among people?
• Describe an activity to show that the magnetic field lines produced when current is passed through the circular coil.
• What is meant by solenoid? How does a current carrying solenoid behave? Give its main use
• What are magnetic field lines? Justify the following statements
• (a) Two magnetic field lines never intersect each other.
• (b) Magnetic field lines are closed curves.
• What is short circuiting? State one factor/condition that can lead to it. Name a device in the household that acts as a safety measure for it. State the principle of its working.
• Traffic jams, outside the school gate was a common sight since most of the students came on their own cars. This became a topic for discussion on every P.T.A meeting. On one such P.T.A meeting, the principle pointed out the examples of four of their teachers who were carpooling for the past several years. She asked the parents to adopt this method to sort out the problem.
• (i) List two values shown by the teachers mentioned by the principal.
• (i) Explain two advantages that will occur if more parents emulate the examples of these teachers.
• On returning home, Neha, a IXth std. student noticed that her 6 years old brother Neresh, watching T.V in the afternoon with all the lights and fans ‘on’. She noticed that the windows were closed and curtains were drawn, which made the room dark, so, Naresh had put on the lights. She calmly opened the windows, drew the curtain aside, which illuminated and aerated the room. Then she made Naresh put “off” the lights and made him understand the reason behind her action. (Assume that they are getting electric supply from Thermal Power Plant)
• (a) List the two value exhibited by Neha
• (b) Explain how she tried to give same values to her brother.

## Important Long Answer Type Questions

Question numbers 16 to 21 in Section-A are 5 marks questions. These are to be answered in 70 words each.

• 1. A torch bulb is rated at 3V and 600mA. Calculate it’s
• (a) Power
• b) Resistance
• c) Energy consumed if it is lighted for 4 Hrs.
• 2. State and derive joule’s law. An electric iron consumes energy at rate of 420w when heating is at maximum rate and 180 w when heating is at minimum. The voltage is 220V .What is the current and resistant in each case?
• 3. A piece of wire having a resistance R is cut into five equal parts.
• (i) How will the resistance of each part of the wire compare with the original resistance?
• (ii) If the five parts of the wire are placed in parallel, how will the resistance of the combination compare with the resistance of the original wire? What will be ratio of resistance in series to that of parallel?
• 4. How can three resistors of resistances 2 Ω , 3 Ω , and 6 Ω be connected to give a total resistance of (a) 4 Ω , (b) 1 Ω?
• 5. Draw a schemata: diagram of a circuit consisting of a battery of three cells of 2 V each, a 5 Ω resistor, 8 Ω resistor, and a 12 Ω resistor, and a plug key, alt connected in series. putting in an ammeter to measure the current through the resistors and a voltmeter to measure the potential different across the 12 Ω resistors. What would be the readings in the ammeter and the voltmeter?
• 6. An electric lamp of 100 Ω, a toaster of resistance. 50 Ω , and a water filter of resistance 500 Ω are connected in parallel to a 220 V source. What is the resistance of an electric iron connected to the same source that takes as much current as all the three appliances, and what is the current through it?
• 7. A spherical mirror produces an image of magnification -1 on a screen placed at a distance of 50 cm from the mirror.
• (a) Write the type of mirror.
• (b) Find the distance of the image from the object.
• (c) What is the focal length of the mirror?
• (d) Draw the ray diagram to show the image formation in this case.
• 8. Draw the ray diagram in each case to show the position and nature of the image formed when the object is placed:
• (i) at the centre of curvature of a concave mirror
• (ii) between the pole P and focus F of a concave mirror
• (iii) in front of a convex mirror
• (iv) at 2F of a convex lens
• (v) in front of a concave lens
• 9. At what distance should an object be placed from a convex lens of focal length 18 cm to obtain an image at 24 cm from it on the other side. What will be the magnification produced in this case
• 10.
• (a) If the image formed by a lens is diminished in size and erect, for all positions of the object, what type of lens is it?
• (b) Name the point on the lens through which a ray of light passes undeviated.
• (c) An object is placed perpendicular to the principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 30 cm. Find (i) the position (ii) the magnification and (iii) the nature of the image formed
• 11.
• (a) Describe activity with labelled diagram to show that a current carrying conductor experience a force in a magnetic field.
• (b) State the rule to determine the direction of force.
• 12. Two coils of insulated copper wire are wound over a non -conducting cylinder as shown. Coil I has larger number of turns.
• (i) Write your observations when,
• (a) key K is closed,
• (b) key K is opened.
• (ii)When the current is passed continuously through coil I. Give reason for your observations.
• (iii)Name and state the phenomenon responsible for the above observation.
• (iv) Write the name of the rule that is used to determine the direction of current produced in the phenomenon.
• (v) Name the two coils used in this experiment.
• 13.
• (i)With the help of an activity, explain the method of inducing electric current in a coil with a moving magnet. State the rule used to find the direction of electric current thus generated in the coil.
• (ii) Two circular coils P and Q are kept close to each other, of which coil P carries a current. What will you observe in Q
• (a) if current in the coil P is changed?
• (b) if both the coils are moved in the same direction with the same speed? Give reason.
• 14. Consider a circular loop of wire lying in the plane of the paper. Let the current
• 15. pass through the loop clockwise. With the help of a diagram, explain how the direction of the magnetic field can be determined inside and outside the loop. Name the law used to find the direction of magnetic field.