     Science | ICSE Board | Grade 10 | 2015
Q. Find the equivalent resistance between points A and B. View Solution  Q. (i) Where should an object be placed so that a real and inverted image of the same size as the object is obtained using a convex lens?
(ii) Draw a ray diagram to show the formation of the image specified in the part (i).
View Solution  Q. Draw a simplified diagram of a lemon crusher, indicating of load and effort.
View Solution  Q. Explain the motion of a planet around the sun in a circular path.
View Solution  Q. (i) Why is a cathode ray tube evacuated to a low pressure?
(ii) What happens if the negative potential is changed on a grid?
View Solution  Q. Rajan exerts a force of 150N in pulling a cart at a constant speed of 10m/s. Calculate the power exerted.
View Solution  Q. State the energy changes in the following while in use:
(i) Burning of candle.
(ii) A steam engine.
View Solution  Q. (i) Name the physical quantity measured in terms of horse power.
(ii) A nut is opened by a wrench of length 20cm. If the least force required is 2N, find the moment of force needed to loosen the nut.
(iii) Explain briefly why the work done by a fielder when he takes a catch in a cricket match is negative.
View Solution  Q. Give two similarities between an A.C. generator and a D.C. motor.
View Solution  Q. (i) On what factor does the position of the centre of gravity of a body depend?
(ii) What is the S.I.unit of the moment of force?
View Solution  Q. When a body is placed on a table top, it exerts a force equal to its weight downwards on the table top but does not move or fall.
(i) Name the force exerted by the table top.
(ii) What is the direction of the force? View Solution  Q. In the diagram 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 into a mode of vibrations.
(i) Name the type of vibrations taking place in pendulums B and D?
(ii) What is the state of pendulum C?
(iii) State the reason for the type of vibrations in pendulums B and C. View Solution  Q. A person standing between two vertical cliffs and 480m from the nearest cliff shouts. He hears the first echo after 3s and the second echo 2s later.
Calculate:
(i) The speed of sound.
(ii) The distance of the other cliff from the person.
View Solution  Q. (i) Draw a graph between displacement and the time for a body executing free vibrations.
(ii) Where can a body execute free vibrations?
View Solution  Q. Rishi is surprised when he sees water boiling at 115oC in a container. Give reasons as to why water can boil at the above temperature.
View Solution  Q. The speed of light in glass is 2×105 km/s. What is the refractive index of glass?
View Solution  Q. (i) What happens to the resistivity of semi-conductors with the increase of temperature?
(ii) For a fuse, higher the current rating ________ is the fuse wire. (Thicker / Thinner)
View Solution  Q. (i) Why does the Sun appear red at sunrise?
(ii) Name the subjective property of light related to its wavelength.
View Solution  Q. (i) Name the device used to increase the voltage at a generating station.
(ii) At what frequency is A.C. supplied to residential houses?
(iii) Name the wire in a household electrical circuit to which the switch is connected.
View Solution  Q. Name the factors affecting the turning effect of a body.
View Solution  Q. (i) Define equilibrium.
(ii) In a beam balance when the beam is balanced in a horizontal position, it is in .................. equilibrium.
View Solution  Q. (i) Name one factor that affects the lateral displacement of light as it passes through a rectangular glass slab.
(ii) On reversing the direction of the current in a wire, the magnetic field produced by it gets ___________
View Solution  Q. (i) State the safe limit of sound level in terms of decibel for human hearing.
(ii) Name the characteristic of sound in relation to its waveform.
View Solution  Q. Jatin puts a pencil into a glass container having water and is surprised to see the pencil in a different state.
(i) What change is observed in the appearance of the pencil?
(ii) Name the phenomenon responsible for the change.
(iii) Draw a ray diagram showing how the eye sees the pencil?
View Solution  Q. How is work done by a force measured when the force:
(i) is in the direction of displacement.
(ii) is at an angle to the direction of displacement.
View Solution  Q. (i) Give the expression for mechanical advantage of an inclined plane in terms of the length of an inclined plane.
(ii) Name a common device where a gear train is used.
View Solution  Q. A block and tackle system has V.R =5
(i) Draw a neat labelled diagram of a system indicating the direction of its load and effort.
(ii) Rohan exerts a pull of 150 kgf. What is the maximum load he can raise with this pulley system if its efficiency is 75%?
View Solution  Q. (i) Name the high energetic invisible electromagnetic waves which help in the study of the structure of crystals.
(ii) State an additional use of the waves mentioned in part (i).
View Solution  Q. (i) Why does a current-carrying freely suspended solenoid rest along a particular direction?
(ii) State the direction in which it rests.
View Solution  Q. (i) A scissor is a _________ multiplier.
(ii) 1 kWh=_________J.
View Solution  