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Important Questions For You!

Chapter 1: Force

Q. 1.. A force is applied on                                                                                                                                 [2M]

  1. a rigid body and
  2. non rigid body.

How does the effect of force differ in the two cases?

Q. 2. Explain the motion of a planet around the Sun in a circular path.                                                                   [2M]

Q. 3. What are                                                                                                                                                  [3M]

  1. Centripetal forces
  2. Centrifugal forces?

Q. 4. State and explain the principle of moments. Draw a diagram to illustrate.                                                      [4M]

Q. 5. A ball is placed near the periphery of a merry-go-round and is tied to its centre. Merry-go-round is rotating about an axis passing through its centre.                                                                                                                                 [4M]

  1. What will be your observation when you are standing outside the merry-go- round? Explain it.
  2. What will be your observation when you are standing at the centre of the merry-go-round? Explain it.


Chapter 2: Work, Energy and Power

Q. 1. A force is applied on a body of mass 20 kg moving with a velocity of 40 ms-1. The body attains a velocity of 50 ms-1 in 2 seconds. Calculate the work done by the body.                                                                                                     [2M]

Q. 2. How is work done by a force measured when the force:                                                                                [2M]

  1. is in the direction of displacement?
  2. is in an angle to the direction of displacement?

Q. 3. An engine can pump 30,000 litres of water to a vertical height of 45 metre in 10 minutes. Calculate the work done by the machine and the power.
(Density of water = 103 kg/m3, 1000 litre = 1 m3, g = 9.8ms-2)                                                                            [3M]


Q. 4. An object 'P' of mass m is lifted from a point A on ground to point B at a height 'h' above the Earth by Rina and Mita, but the path taken for doing it is different by both as shown                                                                                                     [3M]

  1. Calculate the work done in both the situations.
  2. In the above given cases, which force is doing positive work and which one is doing negative work?

Q. 5.                                                                                                                                                                     [4M]

(i) State the energy in the following while in use:

  1. Burning of a candle.
  2. A steam engine.

(ii) On what basis would you classify an energy source as renewable? State two advantages and two limitations of the energy received from the Sun.


Chapter 3: Machines

Q. 1. A type of single pulley is very often used as a machine even though it does not give any mechanical advantage.    [2M]

  1. Name the type of pulley used.
  2. For what purpose is such a pulley used?

Q. 2. Draw a simplified diagram of a lemon crusher, indicting of load and effort.                                                           [2M]
Q. 3. A coolie is pushing a box weighing 1500 N up an inclined plane 7.5 m long on to a platform 2.5 m above the ground. [3M]

  1. Calculate the mechanical advantage of the inclined plane.
  2. Calculate the effort applied by the coolie.


Q. 4. Derive a relationship between the mechanical advantage, the velocity ratio and the efficiency of a machine.           [3M]

Q. 5. A block and tackle pulley system has a velocity ratio of 3.                                                                                   [4M]

  1. Draw a labelled diagram of this system. In your diagram, indicate clearly the points of application and the directions of the load and the effort.
  2. Why should the lower block of this pulley system be of negligible weight?


Chapter 4: Refraction of Light at Plane Surfaces 

Q. 1.                                                                                                                                                                      [2M]

  1. The refractive index of glass with respect to air is 1.5. What is the value of refractive index of air with respect to glass?
  2. A ray of light is incident as a normal ray on the surface of separation of two different mediums. What is the value of the angle of incidence in this case?

Q. 2. What are the necessary conditions for the total internal reflection?                                                                      [2M]

Q. 3.                                                                                                                                                                      [2M]

  1. Can the absolute refractive index of a medium be less than one?
  2. A coin placed at the bottom of a beaker appears to be raised by 4.0 cm. If the refractive index of water is 4/3, find the depth of the water in the beaker.

Q. 4. The refractive index of glass is 1.5. From a point P inside a glass block, draw rays PA, PB and PC incident on that glass-air surface at an angle of 30o, 42o and 60o respectively.                                                                                                 [3M]

  1. In the diagram show the approximate direction of these rays as they emerge out of the block.
  2. What is the angle of refraction for the ray PB?

Q. 5.  A ray of light of wavelength 5400Å suffers refraction from air to glass. Taking aμg = 1.5 , find the wavelength of light in glass [3M]


Chapter 5: Refraction through a Lens


Q. 1. Riya claims to have obtained an image twice the size of the object with a concave lens. Is she correct? Give a reason for your answer.                                                                                                                                                                 [2M]

Q. 2. A lens forms the image of an object placed at a distance 15 cm from it, at a distance 60 cm in front of it. Find: (i) the focal length, (ii) the magnification, and the nature of image.                                                                                             [2M]

Q. 3. A linear object is placed on the axis of a lens. An image is formed by refraction in the lens. For all positions of the object on the axis of the lens, the position of the image is always between the lens and the object.                                                   [3M]

  1. Name the lens.
  2. Draw a ray diagram to show the formation of the image of an object placed in front of the lens at any position of your choice except infinity.

Q. 4. An object AB is placed between 2F1 and F1 on the principal axis of the convex lens as shown in the diagram below:   [4M]



Copy the diagram and using the rays starting from point A, obtain the image of the object formed by the lens.


Chapter 6: Spectrum

Q. 1.                                                                                                                                                                     [2M]

  1. Name a prism required for obtaining a spectrum of Ultraviolet light.
  2. Name the radiations which can be detected by a thermopile.

Q. 2. Name the radiations:                                                                                                                                      [3M]

  1. That are used for photography at night.
  2. That are used for detection of fracture in bones.
  3. Whose wavelength ranges from 100 Å to 4000 Å (or 10 nm to 400nm).

Q. 3. A type of electromagnetic wave has wavelength50Å                                                                                          [3M]

  1. Name the wave.
  2. What is the speed of the wave in vacuum?
  3. State one use of this type of wave.

Q. 4. A ray of white light is passed through a glass prism and spectrum is obtained on a screen.                                   [3M]

  1. Name the seven colours of the spectrum in order.
  2. Do the colours have the same width in the spectrum?
  3. Which of the colour of the spectrum of white light deviates (i) the most? (ii) the least? 

Q. 5. The diagram shown below shows the path taken by a narrow beam of yellow monochromatic light passing through an equiangular glass prism. Now the yellow light is replaced by a narrow beam of white light incident at the same angle. Draw another diagram to show the passage of the beam through the prism and label it to show the effect of prism on the white light.  [3M]


Chapter 7: Sound

Q. 1.                                                                                                                                                                     [2M]

  1. State the safe limit of sound level in terms of decibel for human hearing.
  2. Name the characteristic of sound in relation to its wave form.

Q. 2. Radar sends a signal to an aeroplane at a distance 45 km away with a speed of 3×108 ms-1. After how long is the signal received back from the aeroplane?                                                                                                                          [2M]

Q. 3.                                                                                                                                                                         [3M]

  1. A man standing between two cliffs produces a sound and hears two successive echoes at intervals of 3 s and 4 s respectively. Calculate the distance between the two cliffs. The speed of sound in the air is 330ms-1.
  2. Why will an echo not be heard when the distance between the source of the sound and the reflecting surface is 10m?


Q. 4.                                                                                                                                                                   [4M]

  1. What is meant by the terms (a) amplitude and (b) frequency of a wave?
  2. Explain why stringed musical instruments, like the guitar, are provided with a hollow box.

Q. 5. In the diagram below, A, B, C, D are four pendulums suspended from the same elastic string PQ. The length of A and C are equal to each other while the length of pendulum B is smaller than that of D. Pendulum A is set in to a mode of vibrations. [4 M]

  1. Name the type of vibrations taking place in pendulums B and D?
  2. What is the state of pendulum C?
  3. State the reason for the type of vibrations in pendulum B and C.

 

Chapter 8: Current Electricity

Q. 1. The V-I graph for a series combination and for a parallel combination of two resistors is shown in the figure below. Which of the two A or B. represents the parallel combination? Give reasons for your answer.                                                                  [2M]

 

Q. 2.                                                                                                                                                                           [2M]

  1. State Ohm’s law.
  2. A metal wire of resistance 6 Ω is stretched so that its length is increased to twice its original length. Calculate its new resistance.

Q. 3. A cell of e.m.f. 1.5 V and internal resistance 1.0 Ω is connected to two resistors of 4.0 Ω and 20.0 Ω in a series as shown in the figure drawn below:                                                                                                                                                      [3M]



Calculate the:

  1. Current in the circuit.
  2. Potential difference across the 4.0 ohm resistor.
  3. Voltage drop when the current is flowing.
  4. Potential difference across the cell

Q. 4.                                                                                                                                                                         [3M]

  1. Draw a graph of Potential difference (V) versus Current (I) for an ohmic resistor.
  2. How can you find the resistance of the resistor from this graph?
  3. What is a non-ohmic resistor?

Q. 5. Five resistors of different resistances are connected together as shown in the figure below. A 12 V battery is connected to the arrangement. Calculate:                                                                                                                                             [4M]

  1. The total resistance of the circuit.
  2. The total current flowing through the circuit.


Q. 6. A cell of emf 2 V and internal resistance 1.2 Ω is connected with an ammeter of resistance 0.8 Ω and two resistors of 4.5 Ω and 9 Ω as shown in the diagram below:                                                                                                                         [4M]

 

  1. What would be the reading on the Ammeter?
  2. What is the potential difference across the terminals of the cell.


Chapter 9: Electrical Power and Household Circuits

Q. 1. Of the three connecting wires in a household circuit:                                                                                      [2M]

  1. Which of the two wires are at the same potential?
  2. In which of the three wires should the switch be connected?

Q. 2. An electric heater is rated 1000 W – 200V.Calculate:                                                                                      [2M]

  1. The resistance of the heating element.
  2. The current flowing through it.

Q. 3.                                                                                                                                                                  [3M]

  1. Name the transformer used in the power transmitting station of a power plant.
  2. What type of current is transmitted from the power station?
  3. At what voltage is this current available to our house hold?

Q. 4.                                                                                                                                                                 [3M]

  1. What is meant by the earthing of an electrical appliance? Why is it essential?
  2. What will be the effect on the working of an electric bell, if instead of a direct current, an alternating current is used?

Q. 5.                                                                                                                                                                [4M]

  1. In what unit does the domestic electric meter measure the electrical energy consumed? State the value of this unit in the S.I. Unit.
  2. Why should switches always be connected to the livewire?
  3. Give one precaution that should be taken while handling switches.
 

Chapter 10: Calorimetry


Q. 1. A hot solid of mass 60 g at 100°C is placed in 150 g of water at 20°C. The final steady temperature recorded is 25°C. Calculate the specific heat capacity of the solid. [Specific heat capacity of water = 4200 Jkg-10C-1]                                       [2M]

Q. 2.                                                                                                                                                                [2M]

  1. Name a gas caused by the Green house effect.
  2. Which property of water makes it an effective coolant?

Q. 3.                                                                                                                                                               [3M]

  1. It is observed that the temperature of the surrounding starts falling when the ice in a frozen lake starts melting. Give a reason for the observation.
  2. How is the heat capacity of the body related to its specific heat capacity?


Q. 4. A refrigerator converts 100 g of water at 20°C to ice at −10°C in 35 minutes. Calculate the average rate of heat extraction in terms of watts.                                                                                                                                                [4M]
Given: Specific heat capacity of ice = 2.1 J g−1°C−1
Specific heat capacity of water = 4.2 J g−1°C−1
Specific latent heat of fusion of ice = 336J g−1


Chapter 11: Thermionic Emission and Radioactivity

Q. 1. Which of the radioactive radiations                                                                                                          [2M]

  1. Can cause severe genetic disorders?
  2. Are deflected by an electric field?

Q. 2. Complete the following nuclear changes:

 begin mathsize 12px style straight i. space NA presubscript 11 presuperscript 24 rightwards arrow..... Mg to the power of..... end exponent plus to the power of 0 space straight beta presubscript negative 1 end presubscript
ii. space straight U presubscript 92 presuperscript 238 rightwards arrow straight T presuperscript 234 subscript 90 straight h plus straight x with minus on top space Energy space end style

Q. 3. Arrange αβ, and γ rays in ascending order with respect to their                                                               [3M]

  1. Penetrating power.
  2. Ionizing power.
  3. Biological effect.

Q. 4.

  1. What happens to the atomic number of an element when it emits:
    a) Atomic number decreases by 2.
    b) Atomic number increases by 1.
  2. Alpha particles are positively charged and beta particles are negatively charged. Hence, they are deflected by electric and magnetic fields. Gamma rays are not deflected because they are neutral in nature.

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