List of top Questions asked in ICSE Class X board- 2026

A stone is tied to a string and displaced from A to B by application of a constant force F in three different ways as shown in the diagram below. Arrange the three cases in ascending order of the work done by the force. (Given AJB is a semi-circle, 0\(^\circ\)<\(\theta\)<90\(^\circ\) and AB = 20 m)
The correct formula to calculate the equivalent resistance of R\(_1\) and R\(_2\) when connected in parallel, is:
(a) 1. Which element is used in the lining of the special aprons worn by workers in nuclear power plants?
2. Why is this element preferred?
(b) \(^{24}_{11}\)Na emits a nuclear radiation which does not alter the mass number and is deflected by a magnetic field.
1. Name the type of nuclear radiation emitted by \(^{24}_{11}\)Na.
2. Write the equation for this radioactive decay.
When the magnet as shown in the diagram, is moved towards the coil at a speed of 5 ms\(^{-1}\), the galvanometer shows a certain deflection to the right.
How will the direction and magnitude of deflection change when the coil also moves with a speed of 5 ms\(^{-1}\):
(a) in the direction of the motion of the magnet?
(b) in the opposite direction of the motion of the magnet?
An electric iron rated 1100 W, 220 V is operated for 5 hours.
Calculate:
(a) the minimum rating of the fuse required.
(b) the energy consumed in kWh.
(c) the cost of the energy consumed, if the rate is Rupees 10 per unit.
In the combinations of resistors shown below, calculate:
(a) the resistance across AB when the switch S is open.
(b) the resistance across AB when the switch S is closed.
Bulb A rated 160 W, 40 V and Bulb B rated 40 W, 40 V are connected as shown in the diagram.
(a) Calculate the ratio V\(_1\) : V\(_2\)
(b) If the bulb A fuses, the current in the circuit remains the same. State True or False.
Two persons A and B are standing in front of a cliff in the same line 170 m apart as shown in the diagram. Person B fires the gun and hears the echo in 3 s. Then the person A standing in front of the person B fires the gun. (The speed of sound in air is 340 m/s.)
(a) Calculate:
1. the distance of the person B from the cliff.
2. the minimum time in which B hears the gunshot fired by A.
(b) Fill in the blank. The echo is softer (less loud) than the original sound due to the decrease in __________ of the wave. (amplitude / frequency)
(a) One end of a plastic foot ruler is held tightly at the edge of a table and the other end is plucked. Name the vibrations produced in the ruler.
(b) Now the ruler is pushed inside partially and plucked again from its free end. State with a reason whether the frequency of vibration increases or decreases.
A ball of mass 20 g falls from a height of 45 m. It rebounds from the ground to a height of 40 m. Calculate:
(a) the initial potential energy of the ball.
(b) the speed of the ball at which it hits the ground.
(c) the loss in kinetic energy on striking the ground.
[g = 10 m/s\(^2\)]
To which class of lever does a pair of scissors belong?
Name the unit of work done, used in subatomic scale.
The given graph represents the cooling curve of a liquid.
(a) State the freezing temperature of the liquid.
(b) Name the phase change happening at the region QR.
(c) In which state (solid / liquid) does the above substance liberate heat at a faster rate? Justify.
(a) Atmospheric temperature after a hailstorm is greater than the temperature during the hailstorm. State True or False.
(b) Which thermal physical quantity of a frying pan changes by making the base heavier?
(c) State the principle of Calorimetry.
An object placed in front of a convex lens, forms an image of same size on a screen. Moving the object 12 cm closer to the lens results in the formation of a real image which is three times the size of the object. Calculate the focal length of the lens.
A type of glass block has a refractive index of 1.8.
(a) Calculate the speed of light in this glass. (Given speed of light in air \(c = 3 \times 10^8\) ms\(^{-1}\))
(b) If the width of this block is doubled, then what will be the speed of light in the block?
A ray of light enters a glass block from air and comes out from the opposite surface. If the angle of refraction at the first surface is not the same as the angle of incidence at the second surface, then:
(a) What is the product of the ratio \(\frac{\sin i}{\sin r}\) at the first surface and at the second surface?
(b) State whether the opposite surfaces are parallel or not parallel.
(c) How did you reach the conclusion in (b) above?
Give two differences between nuclear fission and nuclear fusion.
In an AC generator, name the part which has the following functions:
(a) intensifies the magnetic field.
(b) maintains electrical contact between the rotating parts and the external circuit.
A metal piece of thermal capacity 40 JK\(^{-1}\), absorbs 800 J of heat. Calculate the rise in the temperature of this metal piece.
(a) Define natural vibrations.
(b) How is this vibration different from damped vibrations in terms of their amplitudes?
A resistance R is connected across a cell with a switch and a rheostat in series. A voltmeter is connected parallel across the cell. Current in the circuit is increased using the rheostat.
(a) How will the voltmeter reading change? (increase / decrease / remain the same)
(b) Justify your answer stated in (a) above.
What would be the magnification (more than 1 / less than 1 / equal to 1) if the object is placed between F and 2F of the above lens?
The graph below shows the variation of image distance (v) with the object distance (u) when an object is kept in front of a lens. Identify the type of lens used.
Complete the following: __________ radiation deviates minimum in a magnetic field.