English Medium कक्षा १० - CBSE Question Bank Solutions for Science

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

Calculate the total resistance of the circuit and find the total current in the circuit.

These consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:

Assertion: Silver bromide decomposition is used in black and white photography.

Reason: Light provides energy for this exothermic reaction.

How is the mode of action in beating of the heart different from reflex actions? Give four examples.

1. Identify the gasses evolved at the anode and cathode in the above experimental set up.
2. Name the process that occurs. Why is it called so?
3. Illustrate the reaction of the process with the help of a chemical equation.

State Ohm's Law. Represent it mathematically.

What is the resistance of a conductor through which a current of 0.5 A flows when a potential difference of 2V is applied across its ends?

You are provided with a resistor, a key, an ammeter, a voltmeter, four cells of 1.5 V each and few connecting wires. Using circuit components, draw a labelled circuit diagram to show the setup to study Ohm's law.

State the relationship between potential difference (V) across the resistor and the current (I) flowing through it. Also draw V-I graph, taking V on the X-axis.

Let the resistance of an electrical device remain constant, while the potential difference across its two ends decreases to one fourth of its initial value. What change will occur in the current through it? State the law which helps us in solving the above stated question.