English Medium कक्षा १० - CBSE Question Bank Solutions for Science

Draw magnetic field lines produced around a straight current carrying conductor passing through a cardboard. How will the strength of the magnetic field change when the point where magnetic field is to be determined is moved away from the conductor?

At the time of short circuit, the electric current in the circuit ______.

Name the parts (a) to (e) in the following diagram.

What is the term given to the sequence of events occurring in the diagram?

Where does the metal aluminium, used in the process, occurs in the reactivity series of metals?

Answer the following question.
What is the function of a galvanometer in a circuit?

Plants do not have any nervous system but yet, if we touch a sensitive plant, some observable changes take place in its leaves. Explain how could this plant respond to the external stimuli and how it is communicated.

Two electric bulbs rated 100 W; 220 V and 60 W; 220 V are connected in parallel to electric mains of 220 V. Find the current drawn by the bulbs from the mains.

Study the following circuit and find out:
      (i) Current in 12 Ω resistor.
      (ii) The difference in the readings of A₁ and A₂, if any.

Arrange the following metals in the increasing order of their reactivities:

Copper, Zinc, Aluminium, and Iron

Write the chemical equation for the following reaction:
Calcium metal reacts with water.

Write the chemical equation for the following reaction:
Cinnabar is heated in the presence of air.

Write the chemical equation for the following reaction:
Manganese dioxide is heated with aluminum powder.

Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?

(i) Good thermal conductivity

(ii) Good electrical conductivity

(iii) Ductility

(iv) High melting point

Which property of metals is used for making bells and strings of musical instruments like Sitar and Violin?

Which one among the following is an acidic oxide?

An element X is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in the air. It reacts vigorously with water. Identify the element from the following.

Having two eyes facilitates in

A: Increasing the field of view

B: Bringing three-dimensional view

C: Developing the concept of distance/size

Then the correct option is/are

Near and far points of a young person normal eye respectively are:

The ability of the eye lens to adjust its focal length to form a sharp image of the object at varying distances on the retina is called:

The focal length of the eye lens increases when eye muscles ____________.