(English Medium) ICSE Class 10 - CISCE Question Bank Solutions

Explain how the speed of sound can be determined by the method of echo.

State Ohm’s law and draw a neat labelled circuit diagram containing a battery, a key, a voltmeter, an ammeter, a rheostat and an unknown resistance to verify it. 

What is the necessary condition for a conductor to obey Ohm’s law? 

1. Draw a V-I graph for a conductor obeying Ohm’s law.
2. What does the slope of V–I graph  for a conductor represent?

What is an ohmic resistor? Give one example of an ohmic resistor. Draw a graph to show its current voltage relationship. How is the resistance of the resistor determined from this graph?

The lever for which the mechanical advantage is less than 1 has :

Class II levers are designed to have ______.

A 4 m long rod of negligible weight is to be balanced about a point 125 cm from one end and a load of 18 kgf is suspended at a point 60 cm from the support on the shorter arm.

1. If a weight W is placed at a distance of 250 cm from the support on the longer arm to balance the rod, find W.
2. If a weight 5 kgf is kept to balance the rod, find its position.
3. To which class of lever does it belong?

A man uses a crowbar of length 1.5 m to raise a load of 75 kgf by putting a sharp edge below the bar at a distance 1 m from his hand.

1. Draw a diagram of the arrangement showing the fulcrum (F), load (L) and effort (E) with their directions.
2. State the kind of lever.
3. Calculate:
   1. load arm,
   2. effort arm,
   3. mechanical advantage and
   4. the effort needed.

Fig 3.17 below shows a lever in use.

(a) To which class of lever does it belong?
(b) If FA = 80 cm, AB = 20 cm, find its mechanical advantage.
(c) Calculate the value of E.

Which of the following is an ohmic resistance?

In a conductor 6.25 × `10^16` electrons flow from its end A to B in 2 s. Find the current flowing through the conductor (e = 1.6 × `10^-19` C)

An electric bulb draws 1.2 A current at 6.0 V. Find the resistance of filament of bulb while glowing.

A car bulb connected to a 12 volt battery draws 2 A current when glowing. What is the resistance of the filament of the bulb? Will the resistance be more same or less when the bulb is not glowing?

Calculate the current flowing through a wire of resistance 5 Ω connected to a battery of potential difference 3 V.

Draw a diagram to represent the magnetic field lines along the axis of a current carrying solenoid. Mark arrows to show the direction of current in the solenoid and the direction of magnetic field lines.

In an experiment of verification of Ohm’s law following observations are obtained.

Draw a V-I graph and use this graph to find:

1. the potential difference V when the current I is 0.5 A,
2. the current I when the potential difference V is 0.75 V,
3. the resistance in a circuit.

The adjacent diagram shows a small magnet placed near a solenoid AB. Current is switched on in the solenoid by pressing the key K.

1. State the polarity at the ends A and B.
2. Will the magnet be attracted or repelled? Give a reason for your answer.

The following diagram shows a spiral coil wound on a hollow carboard tube AB. A magnetic compass is placed close to it. Current is switched on by closing the key.

1. What will be the polarity at the ends A and B?
2. How will the compass needle be affected? Give reason.

State two ways by which the magnetic field due to a current carrying solenoid can be made stronger.