Introduction

Q.

Write the balanced chemical equation when glucose reacts with oxygen.

Q. Any chemical element (X) can be represented as ${}_Z{X}^A$ where ‘Z’ is the atomic number and ‘A’ is the mass number. The atomic number refers to the number of protons and the mass number refers to the sum of protons and neutrons in an atom. For an element, calcium which has 20 protons and 20 neutrons, identify the correct representation:

1. ${}_{20}C{a}^{40}$
2. ${}_{40}C{a}^{20}$
3. ${}_{20}C{a}^{20}$
4. ${}_{20}C{a}^{60}$

Q. The mass of an atom is due to the mass of its nucleus and the nucleus of an atom contains protons and neutrons, together called as nucleons.

1. True
2. False

Q. Some substances are given below.
I) Air II) Water III) Sand Iv) Butter
Arrange these substances in the increasing order of their kinetic energies.

1. IV < III < I < II
2. IV < III < II < I
3. III < IV < II < I
4. III < IV < I < II

Q. The handles of a pressure cooker are made up of .

1. copper
2. wood
3. iron
4. aluminium

Q. The white marble of Taj Mahal is turning yellow due to atmospheric pollution and acid rain.

1. False
2. True

Q.

What are the main uses of non-metals?

Q.

ZnS+O2=ZnO+CO2

Q. The handles of a pressure cooker are made up of .

1. wood
2. iron
3. copper
4. aluminium

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> What are valence electrons? How many valence electrons does a magnesium atom have?

Q. (1)Fill in the blanks in the following sentences.​

(a) Coal is one of the ______ used to cook food.

(2)
Fill in the blanks in the following sentences.​

(b) When heated in air, coal burns and produces mainly ______ gas.

(3)
Fill in the blanks in the following sentences.​

(c) Coal tar is a black, thick ______ with an ______ smell.

(4)
Fill in the blanks in the following sentences.​

(d) Petroleum, ______ and ______ are fossil fuels.

(5)
Fill in the blanks in the following sentences.​

(e) Forests and coal are ______ natural resources.

Q.

(1)
The underlined words in the following sentences have been jumbled up. Write them in their correct form.​

​(a) Loca is obtained from mines.

(2)
The underlined words in the following sentences have been jumbled up. Write them in their correct form.​

​(b) Umpetlore is a fossil fuel.

(3)
The underlined words in the following sentences have been jumbled up. Write them in their correct form.​

​(c) Rineryfe is a place where various fractions of petroleum are separated

(4)
The underlined words in the following sentences have been jumbled up. Write them in their correct form.​

​(d) Keenrose is a fuel used in jet crafts.

(5)
The underlined words in the following sentences have been jumbled up. Write them in their correct form.​

​(e) Nutsgilh is an example of inexhaustible natural resources.

Q.

Why are forests important? [5 MARKS]

Q.

What is the chemical notation for an element known as?

1. symbol

2. expression

3. short-hand

4. formula

Q.

Why is gold and silver used to make jewellery?

Q. Name a non - metal which exists as a liquid at room temperature.

1. Sulphur
2. Bromine
3. Iodine
4. Chlorine

Q.

Identify the elements in the Periodic Table that are liquid at room temperature.

1. Bromine (Br)
2. Mercury (Hg)
3. Helium (He)
4. Carbon (C)

Q.

​Choose the correct option. Column A contains name of products of petroleum and column B contains their uses. Match them correctly

$$\begin{array}{cc}ColumnA& ColumnB\\ 1.LPG\left(LiquefiedPetroleumGas\right)& A.Paints,RoadSurfacing\\ 2.Petrol& B.Fuelforhomeandindustry\\ 3.Bitumen& C.Ointments,candles,Vaselineetc\\ 4.Paraffinwax& D.MotorFuel,Aviationfueletc\end{array}$$

1. 1-B, 2-D, 3-C, 4-A

2. 1-A, 2-B, 3-C, 4-D

3. 1-B, 2-D, 3-A, 4-C

4. 1-D, 2-C, 3-B, 4-A

Q. The white marble of Taj Mahal is turning yellow due to atmospheric pollution and acid rain.

1. False
2. True

Q. A definite quantity of water and coconut oil are heated in separate test tubes using the same amount of heat.
a) In which case does the temperature increase slowly?
b) What is the reason for this?
c) Write any one practical application of this property.

Q.

At melting point

1. Kinetic energy remains constant and potential energy increase

2. Kinetic energy increases and potential energy remains constant

3. Both kinetic energy and potential energy increases

4. Potential energy increases with decreases in kinetic energy

Q. The number of neutrons present in the element ${}_Z^A\text{X}$ is given by ________.

1. $\text{A-Z}$
2. $\text{Z}$
3. $\text{Z + A}$
4. $\text{Z - A}$

Q. Which is the lightest gas known?

Q. Cloud is an example of __________ mixture.

1. gas in gas
2. liquid in liquid
3. solid in gas
4. liquid in gas

Q. Which among the following is hard in nature?

1. Foam
2. Sponge
3. Diamond
4. Tooth paste

Q. A definite quantity of water and coconut oil are heated in separate test tubes using the same amount of heat.
a) In which case does the temperature increase slowly?
b) What is the reason for this?
c) Write any one practical application of this property.

Q.

What are the main uses of non-metals?

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Define rigidity.

Q. Find number of protons and neutrons for (a), (b) and (c) respectively.

1. $n_p$= 17, 6, 35
   $n_n$= 18, 6, 46
2. $n_p$=16, 6, 35
   $n_n$= 18, 6, 46
3. $n_p$=16, 6, 35
   $n_n$= 18, 6, 45
4. $n_p$=17, 6, 35
   $n_n$= 18, 6, 45

Q. 'Sardar Sarovar Dam' is built in the river

1. Jhelam
2. Narmada
3. Tapti
4. Vyas