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MCQOPTIONS
This section includes 2637 Mcqs, each offering curated multiple-choice questions to sharpen your 7th Class knowledge and support exam preparation. Choose a topic below to get started.
| 2151. |
____ is a compound formed by replacing the hydrogen of an acid by a metal. |
| A. | Base |
| B. | Acid |
| C. | Salt |
| D. | Non-metal |
| E. | None of these |
| Answer» D. Non-metal | |
| 2152. |
Which of the following acids is used to prepare explosives such as TNT? |
| A. | Sulphuric acid |
| B. | Oxalic acid |
| C. | Lactic acid |
| D. | Ammonium hydroxide |
| E. | None of these |
| Answer» B. Oxalic acid | |
| 2153. |
............... is used to neutralize the acidic effect of ant bite by rubbing it at the point of ant bite. |
| A. | Moist baking soda |
| B. | Calamine solution |
| C. | Both (a) and (b) |
| D. | Calcium carbonate |
| Answer» D. Calcium carbonate | |
| 2154. |
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage ? 2 The reaction between an acid and a base is known as neutralization reaction. In this reaction salt and water are produced with evolution of heat. A neutralization reaction is: |
| A. | an exothermic reaction |
| B. | endothermic reaction |
| C. | accompained by absorption of heat |
| D. | None of these is correct |
| Answer» B. endothermic reaction | |
| 2155. |
Identify the salt used in cooking. |
| A. | \[NaCl\] |
| B. | \[MgC{{l}_{2}}\] |
| C. | \[CaC{{l}_{2}}\] |
| D. | \[KCl\] |
| Answer» B. \[MgC{{l}_{2}}\] | |
| 2156. |
Identify the acid present in tamarind. |
| A. | Tannic acid |
| B. | Lactic acid |
| C. | Tartaric acid |
| D. | Citric acid |
| Answer» D. Citric acid | |
| 2157. |
A solution turns red litmus blue, its pH is likely to be |
| A. | 1 |
| B. | 4 |
| C. | 5 |
| D. | 10 |
| Answer» E. | |
| 2158. |
In bases, methyl orange turns: |
| A. | green |
| B. | black |
| C. | red |
| D. | yellow |
| Answer» E. | |
| 2159. |
Borax turns litmus paper |
| A. | Blue |
| B. | Red |
| C. | Pink |
| D. | Purple |
| E. | None of these |
| Answer» B. Red | |
| 2160. |
Salt formed by strong acid and weak base is: |
| A. | Basic |
| B. | Acidic |
| C. | Neutral |
| D. | Volatile |
| E. | None of these |
| Answer» C. Neutral | |
| 2161. |
DIRECTIONS: Read the following three statements and choose the correct answer. (i) The salt formed by the neutralization of \[\text{NaOH}\] with \[\text{HCl}\] is basic in nature. (ii) Milk of magnesia contains magnesium hydroxide. (iii) Bases have pH from 1 to 7. |
| A. | Statement (i) and (iii) are incorrect but (ii) is correct |
| B. | Statement (i) and (ii) are incorrect but (iii) is correct |
| C. | All statements are correct |
| D. | All statements are incorrect |
| Answer» B. Statement (i) and (ii) are incorrect but (iii) is correct | |
| 2162. |
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage ? 2 The reaction between an acid and a base is known as neutralization reaction. In this reaction salt and water are produced with evolution of heat. Which of the following is not an example of neutralization? |
| A. | Taking antacid in case of acidity |
| B. | Treating acidic soil with quick lime |
| C. | Change in colour of blue litmus paper to red with acidic solution |
| D. | Both (a) and (b) |
| Answer» D. Both (a) and (b) | |
| 2163. |
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage ? 1 Observe the flow chart given below and answer the questions that follow: \[\text{Magnesium+Oxygen}\xrightarrow{\text{heat}}\text{''A''}\xrightarrow{\text{Water}}\text{''B''}\xrightarrow[\text{solution}]{\text{Red litmus}}\text{''C''}\] "B" in this represents |
| A. | Magnesium |
| B. | Magnesium oxide |
| C. | Magnesium hydroxide |
| D. | None of these |
| Answer» D. None of these | |
| 2164. |
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 5 Consider the following substances and on that basis answer the following questions: Lemon juice, tomato juice, lime water, vinegar, sugar solution, solution of common salt. The number of basic substances is: |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» B. 2 | |
| 2165. |
Special type of substances used to test whether a substance is acidic/basic are known as: |
| A. | Indicators |
| B. | Acids |
| C. | Bases |
| D. | All the above |
| E. | None of these |
| Answer» B. Acids | |
| 2166. |
Which two acids combine to form aqua regia and in what ratio? |
| A. | 3 parts of sulphuric acid and 1 part of Nitric acid. |
| B. | 2 parts of Nitric acid and 2 parts of hydrochloric acid. |
| C. | 4 parts of Nitric and 2 parts of Hydrochloric acid. |
| D. | 3 parts of hydrochloric acid and 1 part of nitric acid. |
| E. | None of these |
| Answer» E. None of these | |
| 2167. |
In an accident at a factory, some nitric acid was spilled. Which substance, when added in excess would neutralize the acid without leaving an alkaline solution? |
| A. | Aqueous ammonia |
| B. | Aqueous sodium hydroxide |
| C. | Calcium carbonate |
| D. | Water |
| Answer» D. Water | |
| 2168. |
What is injected into the skin when an ant bites? |
| A. | Acid |
| B. | Base |
| C. | Salt |
| D. | Water |
| Answer» B. Base | |
| 2169. |
Acid present in soured curd is |
| A. | Lactic acid |
| B. | Acetic acid |
| C. | Tartaric acid |
| D. | Oxalic add |
| Answer» B. Acetic acid | |
| 2170. |
Identify the only base which does not have a metal in its molecule. |
| A. | \[NaOH\] (Sodium hydroxide) |
| B. | \[N{{H}_{4}}OH\](Ammonium hydroxide) |
| C. | \[Mg{{(OH)}_{2}}\] (Magnesium hydroxide) |
| D. | \[Ca{{(OH)}_{2}}\] (Calcium hydroxide) |
| Answer» C. \[Mg{{(OH)}_{2}}\] (Magnesium hydroxide) | |
| 2171. |
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 2 Three different substances were taken and tested with litmus paper. The results are given below. Based on the results answer the questions 43 to 48. Type of Litmus X Y Z Red litmus turns blue no change no change Blue litmus no litmus turns red no change What could be the substance Z? |
| A. | Water |
| B. | Salt |
| C. | Either A or B |
| D. | Either an acid or a base |
| Answer» D. Either an acid or a base | |
| 2172. |
Rima prepared an indicator paper by dipping a paper strip in a solution of X. She put a few drops of an unknown solution Y which contains \[{{H}^{+}}\] ions less than \[O{{H}^{-}}\] ions on this paper. She observed that the colour of paper turned yellow. What do you think was solution X? |
| A. | Red litmus solution |
| B. | Phenolphthalein |
| C. | Methyl orange |
| D. | Turmeric solution |
| Answer» D. Turmeric solution | |
| 2173. |
Which one of the following can neutralize acids |
| A. | \[Mg{{(OH)}_{2}}\] |
| B. | \[NaHC{{O}_{3}}\] |
| C. | \[HCl\] |
| D. | Both [a] and [b] |
| E. | None of these |
| Answer» E. None of these | |
| 2174. |
A base contained in calamine solution which neutralises the acidic liquid of the ant is: |
| A. | \[Mg{{(OH)}_{2}}\] |
| B. | \[ZnC{{O}_{3}}\] |
| C. | \[HN{{O}_{3}}\] |
| D. | \[NaHC{{O}_{3}}\] |
| E. | None of these |
| Answer» C. \[HN{{O}_{3}}\] | |
| 2175. |
Identify the formula of washing soda from the following, |
| A. | \[NaCl\] |
| B. | \[N{{a}_{2}}C{{O}_{3}}\] |
| C. | \[NaHC{{O}_{3}}\] |
| D. | \[NaOH\] |
| Answer» C. \[NaHC{{O}_{3}}\] | |
| 2176. |
Which of the following substances react with each other to form salt and water only? |
| A. | Dilute sodium hydroxide and dilute hydrochloric acid |
| B. | Magnesium and dilute hydrochloric acid |
| C. | Copper sulphate and dilute sulphuric acid |
| D. | Washing soda solution in water and dilute nitric acid |
| Answer» B. Magnesium and dilute hydrochloric acid | |
| 2177. |
Read the given statements and select the correct option. Statement 1: Baking soda does not taste sour. Statement 2: Bases are sour in taste while acids are bitter in taste. |
| A. | Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. |
| B. | Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. |
| C. | Statement 1 is true and statement 2 is false. |
| D. | Both statements 1 and 2 are false. |
| Answer» D. Both statements 1 and 2 are false. | |
| 2178. |
Properties of an acid is due to the presence of: |
| A. | Ammonium ions |
| B. | Oxide ions |
| C. | Hydrogen ions |
| D. | Hydride ions |
| E. | None of these |
| Answer» D. Hydride ions | |
| 2179. |
Oil of vitriol is historic name of ___. |
| A. | Nitric acid |
| B. | Sulphuric acid |
| C. | Hydronium ions |
| D. | Acetic acid |
| E. | None of these |
| Answer» C. Hydronium ions | |
| 2180. |
DIRECTIONS: The questions in this segment consists of two statements, one labeled as "Assertion A" and the other labeled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Acids are sour in taste. Reason (R): Bases are soapy to touch and bitter in taste. |
| A. | Both A and R are true and R is the correct explanation of A. |
| B. | Both A and R are true but R is not the correct explanation of A. |
| C. | A is true but R is false. |
| D. | A is false but R is true. |
| Answer» C. A is true but R is false. | |
| 2181. |
Which of the following acid is used by gold smith for dissolving gold? |
| A. | Nitric acid |
| B. | Sulphuric acid |
| C. | Aqua regia |
| D. | Hydrochloric acid |
| Answer» D. Hydrochloric acid | |
| 2182. |
In which of the following is ascorbic acid present? |
| A. | Tea and coffee |
| B. | Milk |
| C. | Ants |
| D. | Fruits and vegetables |
| Answer» E. | |
| 2183. |
Animal which does not belong to tropical region? |
| A. | Apes |
| B. | Leopards |
| C. | Elephants |
| D. | Monkeys |
| Answer» E. | |
| 2184. |
Which of the following glands is not associated with alimentary canal? |
| A. | Salivary glands |
| B. | Liver |
| C. | Pancreas |
| D. | All the above |
| Answer» E. | |
| 2185. |
Negative value of work done indicates that |
| A. | Force and displacement are in the same direction |
| B. | More than one force is acting on the object |
| C. | Displacement and force are in opposite directions |
| D. | Both (b) and (c) |
| Answer» E. | |
| 2186. |
Water stored in the water tank at the roof of house has |
| A. | kinetic energy |
| B. | potential energy |
| C. | chemical energy |
| D. | light energy |
| Answer» C. chemical energy | |
| 2187. |
Capacity of doing work is termed as |
| A. | Pressure |
| B. | Energy |
| C. | Force |
| D. | Displacement |
| Answer» C. Force | |
| 2188. |
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage Rishabh, a professional skateboarder, is taking part in a skateboarding competition. Rishabh waits at the top of the ramp before skateboarding down it. Different points on the ramp are marked A, B, C and D. At which point on the ramp will Rishabh nor has any kinetic energy? |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 2189. |
DIRECTIONS: On the basis of following diagram/ picture answer the questions given below: The diagram below shows two children playing on a see-saw. What is the energy conversion that takes place when two children are playing on a see-saw? |
| A. | kinetic energy\[\to \]heat energy\[\to \] gravitational potential energy |
| B. | chemical potential energy\[\to \]kinetic energy\[\to \]gravitational potential energy |
| C. | gravitational potential energy\[\to \]kinetic energy\[\to \]chemical potential energy |
| D. | gravitational potential energy\[\to \]kinetic energy\[\to \]gravitational potential energy |
| Answer» E. | |
| 2190. |
If force and displacement of particle in direction of force are doubled. Work would be |
| A. | double |
| B. | 4 times |
| C. | half |
| D. | 1/4times |
| Answer» C. half | |
| 2191. |
Potential energy of your body is minimum when you |
| A. | are standing |
| B. | are sitting on a chair |
| C. | are sitting on the ground |
| D. | lie down on the ground |
| Answer» E. | |
| 2192. |
Same amount of work has to be done on two objects A and B of same mass by applying force of 8 N and 16 N respectively. Then A will displace |
| A. | more than object B |
| B. | less than object B |
| C. | Same as B |
| D. | Cannot say |
| Answer» B. less than object B | |
| 2193. |
The C.G.S. unit of work is |
| A. | Dyne |
| B. | erg |
| C. | Newton |
| D. | Joule |
| Answer» C. Newton | |
| 2194. |
What is the sign of the work done by gravity on a man standing on a platform? |
| A. | Zero |
| B. | Positive |
| C. | Negative |
| D. | Depends on the particular situation |
| Answer» B. Positive | |
| 2195. |
DIRECTIONS: Read the passage (s) given below and answer the questions that follow. Passage ? 1 Centripetal force is a requirement for circular motion. No work is done on a body by centripetal force in a circular path. The work done by a centripetal force - |
| A. | increases by decreasing the radius of the circle |
| B. | decreases by increasing the radius of the circle |
| C. | increases by increasing the mass of the body |
| D. | is always zero |
| Answer» B. decreases by increasing the radius of the circle | |
| 2196. |
DIRECTIONS: Read the passage (s) given below and answer the questions that follow. Passage ? 1 Centripetal force is a requirement for circular motion. No work is done on a body by centripetal force in a circular path. The moon revolves around the earth because the earth exerts a radial force on the moon. Does the earth perform work on the moon? |
| A. | No |
| B. | Yes, sometimes |
| C. | Yes, always |
| D. | Cannot be decided |
| Answer» E. | |
| 2197. |
DIRECTIONS: On the basis of following diagram/ picture answer the questions given below: A mass hangs on a string fixed at point P. It starts from position 1 and swings to the farthest position on the opposite side, position 2. It then oscillates several times with decreasing amplitude before ending at position 3. Where does the ball have the most kinetic energy? |
| A. | at position 1 |
| B. | at position 2 |
| C. | the first time at position 3 |
| D. | the last time at position 3 |
| Answer» D. the last time at position 3 | |
| 2198. |
Upon heating, gases become lighter. Why? |
| A. | Increase in molecular spaces |
| B. | Decrease in molecular spaces |
| C. | Breaking of molecules |
| D. | Formation of new molecules |
| Answer» B. Decrease in molecular spaces | |
| 2199. |
What would happen if the Earth did not rotate on its axis? |
| A. | All winds would blow curved and deflected at equator only. |
| B. | All winds would not blow curved and deflected at poles only. |
| C. | All winds would blow straight from high pressure to low pressure area and die when the pressure equalized. |
| D. | All winds would blow straight from low pressure to high pressure area and die when the pressure is equalized. |
| Answer» D. All winds would blow straight from low pressure to high pressure area and die when the pressure is equalized. | |
| 2200. |
Direction of land breeze will be from: |
| A. | Land to land |
| B. | Land to sea |
| C. | Sea to land |
| D. | Sea to sea |
| Answer» C. Sea to land | |