MCQOPTIONS
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MCQOPTIONS
This section includes 229 Mcqs, each offering curated multiple-choice questions to sharpen your Grade9 knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
1 atmospheric pressure is equal to |
| A. | 100.345 Pa |
| B. | 760 kPa |
| C. | 101.325 kPa |
| D. | 1.01325 mmHg |
| Answer» D. 1.01325 mmHg | |
| 102. |
The process in which the vapor molecules are recaptured by the molecules at the liquid surface is called |
| A. | evaporation |
| B. | sublimation |
| C. | condensation |
| D. | boiling |
| Answer» D. boiling | |
| 103. |
Solids whose atoms arrange themselves in different forms are |
| A. | isotopes |
| B. | crystals |
| C. | allotropes |
| D. | amorphous |
| Answer» D. amorphous | |
| 104. |
As compare to beryllium, the magnesium is |
| A. | large in size only |
| B. | more electropositive only |
| C. | less electropositive |
| D. | large in size and more electropositive |
| Answer» E. | |
| 105. |
Bromine is a non-metal in |
| A. | solid state |
| B. | liquid state |
| C. | gaseous state |
| D. | plasma state |
| Answer» C. gaseous state | |
| 106. |
As the size of the atom increases down the group, the electro positivity |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | none of above |
| Answer» B. decreases | |
| 107. |
Elements which have properties of metals and non-metals are |
| A. | amorphous |
| B. | crystalline |
| C. | metalloids |
| D. | metals |
| Answer» D. metals | |
| 108. |
The sodium metal is soft due to |
| A. | weak metallic bond |
| B. | strong metallic bond |
| C. | large size |
| D. | small size |
| Answer» B. strong metallic bond | |
| 109. |
Groups contain alkaline earth metals are |
| A. | IA |
| B. | IIIA |
| C. | IIA |
| D. | IVA |
| Answer» D. IVA | |
| 110. |
The value of ionization energy |
| A. | decreases down the group |
| B. | increases down the group |
| C. | remains same down the group |
| D. | decreases in period |
| Answer» B. increases down the group | |
| 111. |
When an electron is added in the valence shell than |
| A. | energy is absorbed |
| B. | energy is released |
| C. | energy remains same |
| D. | force of attraction increases |
| Answer» C. energy remains same | |
| 112. |
In periodic table elements with similar valence shell configuration are placed in |
| A. | different groups |
| B. | same group |
| C. | different period |
| D. | same period |
| Answer» C. different period | |
| 113. |
The period number of 2713Al is |
| A. | 1 |
| B. | 2 |
| C. | 4 |
| D. | 3 |
| Answer» E. | |
| 114. |
On increasing the temperature of amorphous solid they |
| A. | melt at specific temperature |
| B. | soften gradually |
| C. | break at specific temperature |
| D. | boil at specific temperature |
| Answer» C. break at specific temperature | |
| 115. |
The pressure that vapors apply on the surface of the liquid at equilibrium is called |
| A. | torr |
| B. | vapor pressure |
| C. | liquid pressure |
| D. | condensation |
| Answer» C. liquid pressure | |
| 116. |
The molecules of liquid which escape first have |
| A. | highest kinetic energy |
| B. | lowest kinetic energy |
| C. | moderate kinetic energy |
| D. | infinite kinetic energy |
| Answer» B. lowest kinetic energy | |
| 117. |
For a certain reaction PV = 2 dm3 atm and volume is 4 dm3 then the corresponding pressure is |
| A. | 1 atm |
| B. | 4 atm |
| C. | 0.5 atm |
| D. | 2 atm |
| Answer» D. 2 atm | |
| 118. |
The mathematical expression that describes Boyle's law is |
| A. | PV = constant |
| B. | V * constant = P |
| C. | P * constant = V |
| D. | V ⁄ P = constant |
| Answer» B. V * constant = P | |
| 119. |
The number of protons in the nucleus constitute it's |
| A. | atomic mass |
| B. | atomic number |
| C. | nucleon number |
| D. | number of neutrons |
| Answer» C. nucleon number | |
| 120. |
1 mole of a substance refers to |
| A. | molar mass |
| B. | atomic mass |
| C. | electron mass |
| D. | neutron mass |
| Answer» B. atomic mass | |
| 121. |
Branch of chemistry dealing with the plantation and overcoming greenhouse effect is |
| A. | Biochemistry |
| B. | Organic chemistry |
| C. | Environmental chemistry |
| D. | Inorganic chemistry |
| Answer» D. Inorganic chemistry | |
| 122. |
The smallest part of an element that cannot exist as a free state is |
| A. | ion |
| B. | charge |
| C. | atom |
| D. | molecule |
| Answer» D. molecule | |
| 123. |
The number of protons and neutrons in the nucleus if the atomic number of an element is 17 and the mass number is 35, is |
| A. | 17 and 18 |
| B. | 17 and 19 |
| C. | 17 and 20 |
| D. | 17 and 21 |
| Answer» B. 17 and 19 | |
| 124. |
A balloon filled with 5g of hydrogen contains |
| A. | 2.48 moles of H2 |
| B. | 3.48 moles of H2 |
| C. | 4.48 moles of H2 |
| D. | 5 moles of H2 |
| Answer» B. 3.48 moles of H2 | |
| 125. |
A hydrogen atom is |
| A. | 8.40% as massive as C-12 |
| B. | 10% as massive as C-12 |
| C. | 20% as massive as C-12 |
| D. | 30% as massive as C-12 |
| Answer» B. 10% as massive as C-12 | |
| 126. |
A substance whose all atoms have the same atomic number is |
| A. | molecule |
| B. | atom |
| C. | element |
| D. | ion |
| Answer» D. ion | |
| 127. |
The gram atomic mass of Zn is |
| A. | 23g |
| B. | 12g |
| C. | 63.54g |
| D. | 56.67g |
| Answer» D. 56.67g | |
| 128. |
In a pressure cooker, the pressure applied is |
| A. | 1 atm |
| B. | 2 atm |
| C. | 3 atm |
| D. | 4 atm |
| Answer» C. 3 atm | |
| 129. |
Boiling point is the temperature at which vapor pressure is |
| A. | more than external pressure |
| B. | less than external pressure |
| C. | not related to external pressure |
| D. | equal to external pressure |
| Answer» E. | |
| 130. |
On applying pressure the volume of gas |
| A. | increases |
| B. | remains same |
| C. | becomes double |
| D. | decreases |
| Answer» E. | |
| 131. |
The position of liquid molecules are |
| A. | fixed |
| B. | not fixed |
| C. | not sliding |
| D. | none of above |
| Answer» C. not sliding | |
| 132. |
As the molecular mass of gasses increases their density |
| A. | decreases |
| B. | increases |
| C. | remains constant |
| D. | none of above |
| Answer» C. remains constant | |
| 133. |
The formula mass indicates the simplest ration between |
| A. | cations only |
| B. | anions only |
| C. | atoms |
| D. | cation and anions |
| Answer» E. | |
| 134. |
The list which contains only elements is |
| A. | air, water, oxygen |
| B. | Hydrogen, oxygen, brass |
| C. | Air, water, fire, earth |
| D. | Calcium, Sulphur, carbon |
| Answer» E. | |
| 135. |
Over 70% of earth's crust is covered with |
| A. | water |
| B. | land |
| C. | coal |
| D. | trees |
| Answer» B. land | |
| 136. |
The mass of an atom relative to C-12 is |
| A. | atomic mass |
| B. | atomic number |
| C. | nucleon number |
| D. | relative atomic mass |
| Answer» E. | |
| 137. |
The relative atomic mass of Na is |
| A. | 1.008 amu |
| B. | 22.9898 amu |
| C. | 26.9815 amu |
| D. | 15.9994 amu |
| Answer» C. 26.9815 amu | |
| 138. |
Iodine-123 is used to |
| A. | diagnose thyroid problem |
| B. | image the brain |
| C. | kill cancer cells |
| D. | trace the blood flow |
| Answer» C. kill cancer cells | |
| 139. |
Rutherford bombarded thin gold foil with |
| A. | α particles |
| B. | β particles |
| C. | γ particles |
| D. | neutrons |
| Answer» B. β particles | |
| 140. |
Atoms having same atomic number but different atomic mass are called |
| A. | derivatives |
| B. | isotopes |
| C. | elements |
| D. | isomers |
| Answer» C. elements | |
| 141. |
The energy of emitted light is equal to |
| A. | sum of energy levels |
| B. | difference between energies of orbits |
| C. | product of energies of orbits |
| D. | none of above |
| Answer» C. product of energies of orbits | |
| 142. |
α particles are |
| A. | positively charged |
| B. | doubly positively charged |
| C. | negatively charged |
| D. | doubly negatively charged |
| Answer» C. negatively charged | |
| 143. |
Commercially concentrated HCl is |
| A. | 0.4 |
| B. | 0.5 |
| C. | 0.37 |
| D. | 0.8 |
| Answer» D. 0.8 | |
| 144. |
At a particular temperature, the solution which cannot dissolve more solute is called |
| A. | saturated solution |
| B. | unsaturated solution |
| C. | aqueous solution |
| D. | supersaturated solution |
| Answer» B. unsaturated solution | |
| 145. |
Solubility is the amount of solute dissolved in |
| A. | 50 g of solvent |
| B. | 100 g of solvent |
| C. | 250 g of solvent |
| D. | 200 g of solvent |
| Answer» C. 250 g of solvent | |
| 146. |
The solution of mercury with other metals is called |
| A. | amalgam |
| B. | saturated solution |
| C. | supersaturated solution |
| D. | unsaturated solution |
| Answer» B. saturated solution | |
| 147. |
A mixture that has a uniform composition throughout is called |
| A. | saturated solution |
| B. | super saturated solution |
| C. | solution |
| D. | solvent |
| Answer» D. solvent | |
| 148. |
In amalgams the solvent is |
| A. | gas |
| B. | liquid |
| C. | solid |
| D. | none of above |
| Answer» D. none of above | |
| 149. |
The concentration of a dilute solution is |
| A. | high |
| B. | very high |
| C. | same |
| D. | low |
| Answer» E. | |
| 150. |
In solutions the particles are |
| A. | invisible |
| B. | visible by naked eye |
| C. | visible by ordinary microscope |
| D. | visible by electron microscope |
| Answer» B. visible by naked eye | |