English Medium कक्षा १० - CBSE Question Bank Solutions

The temperature of a conductor is increased. The graph best showing the variation of its resistance is:

A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R₁, R₂ and R₃ respectively. Which of the following is hue?

A positive charge is moving towards a person. The direction of magnetic field lines will be in ____________.

Assertion: The statement of Ohm’s law is K = IR.

Reason: V = IR is the equation which defines resistance.

A current through a horizontal power line flows from south to north direction. The direction of magnetic field line 0.5m above it is ____________.

The strength of each magnet reduces to half when it is cut along its length into the equal parts magnetic field strength of a solenoid. The polarity of the solenoid can be determined by ____________.

A positive charge is moving upwards in a magnetic field directed towards the north. The particle will be deflected towards ____________.

Assertion: Decomposition of vegetable matter into compost is an endothermic reaction.

Reason: Decomposition reaction involves breakdown of a single reactant into simpler products.

Who has stated the Right-hand Thumb Rule?

Marble statues are corroded or stained rain water. Identify the main reason.

Balance the following chemical equation and identify the type of chemical reaction.

`"HgO"("s") overset("(heat)")(->) "Hg"("l") + "O"_2("g")`

Balance the following chemical equation and identify the type of chemical reaction.

`"H"_2"O"_2("l") overset("U  V")(->) "H"_2"O"("l") + "O"_2("g")`

On heating blue coloured powder of copper (II) nitrate, in a boiling tube, copper oxide (black), oxygen gas and a brown gas X is formed

1. Write a balanced chemical equation of the reaction.
2. Identify the brown gas X evolved.
3.  Identify the type of reaction.
4. What could be the pH range of aqueous solution of the gas X?

Buckminsterfullerene is an allotropic form of

Which of the following is not an involuntary action?

A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R₁, R₂ and R₃ respectively. Which of the following is true? 

Choose the incorrect statement

A constant current flows in a horizontal wire in the plane of the paper from east to west as shown in Figure. The direction of magnetic field at a point will be North to South

The strength of magnetic field inside a long current carrying straight solenoid is