English Medium कक्षा ९ - CBSE Question Bank Solutions for Science

A student wants to have 3.011 × 1023 atoms each of magnesium and carbon elements. For this purpose, he will have to weigh :

Define atomic mass unit. What is its symbol ?

Out of ozone, phosphorus, sulphur and krypton, the elements having the lowest and highest atomicities are respectively :

Differentiate the following.

Farmyard manure and Sheep manure

The chemical symbol for sodium is

Which of the following would weigh the highest?

Mass of one atom of oxygen is

Which of the following symbols of elements are incorrect? Give their correct symbols

1.  Cobalt CO
2. Carbon c
3. Aluminium AL
4. Helium He
5. Sodium So

On the basis of Rutherford’s model of an atom, which subatomic particle is present in the nucleus of an atom?

Identify the Mg2+ ion from the Fig. where, n and p represent the number of neutrons and protons respectively

Calculate the number of neutrons present in the nucleus of an element X which is represented as `""_15^31"X"`

Choose the wrong statement

______ and ______ are both conducting tissues.

Find out incorrect sentence

Write true (T) or false (F)

Anabaena belongs to the kingdom Monera.

Four cars A, B, C, and D are moving on a levelled road. Their distance versus time graphs are shown in Fig. 8.2. Choose the correct statement.

Two substances, A and B were made to react to form a third substance, A2B according to the following reaction

\[\ce{2A + B -> A2 B}\]

Which of the following statements concerning this reaction are incorrect?

(i) The product A2B shows the properties of substances A and B

(ii) The product will always have a fixed composition

(iii) The product so formed cannot be classified as a compound

(iv) The product so formed is an element

Slope of a velocity-time graph gives

In which of the following cases of motions, the distance moved and the magnitude of displacement are equal?

The displacement of a moving object in a given interval of time is zero. Would the distance travelled by the object also be zero? Justify your answer.