Scientific Reasoning MCQs

Question 1

Experiment: A litmus paper was dipped into a lemon juice sample.Observation: The blue litmus turned red.Question: What does this confirm?

Accepted Answer

Lemon juice is acidic in nature.

Answer

Lemon juice is neutral.

Answer

It contains basic salts.

Answer

Litmus is unreactive with lemon.

Question 2

Experiment: Dilute sulfuric acid was added to barium chloride solution.Observation: A white insoluble solid formed immediately.Question: What reaction occurred?

Accepted Answer

Formation of barium sulfate as a precipitate.

Answer

Neutralization of acid and base.

Answer

Formation of hydrochloric acid.

Answer

Combustion of sulfur compounds.

Question 3

Experiment: A piece of sodium was dropped in water in a trough.Observation: It moved rapidly, producing fizzing and a colorless gas that burned with a pop.Question: What gas was released?

Accepted Answer

Hydrogen gas from sodium-water reaction.

Answer

Carbon dioxide from water.

Answer

Oxygen from salt decomposition.

Answer

Nitrogen from sodium nitrate.

Question 4

Experiment: Magnesium ribbon was burned in a jar of carbon dioxide.Observation: A white ash was formed and black carbon was deposited.Question: What does this show?

Accepted Answer

Magnesium can reduce CO₂ to carbon.

Answer

Magnesium evaporates in CO₂.

Answer

Carbon dioxide is neutral gas.

Answer

CO₂ acts as an oxidizing agent.

Question 5

Experiment: Concentrated hydrochloric acid was placed in a beaker and a glass rod dipped in ammonia was brought near.Observation: Dense white fumes were observed.Question: What is being formed?

Accepted Answer

Ammonium chloride due to combination of HCl and NH₃.

Answer

Sulfuric acid vapor reacting with water.

Answer

Ammonia decomposing in air.

Answer

Precipitate of hydrogen gas.

Question 6

Experiment: Iron nails were placed in a solution of copper sulfate, and after 30 minutes, they were rinsed and weighed.Observation: Mass increased due to a layer of another metal.Question: What does this confirm?

Accepted Answer

Displacement reaction where iron replaces copper.

Answer

Corrosion by copper ions.

Answer

Coating due to evaporation.

Answer

Precipitation of salt on iron.

Question 7

48 competitors entered the men's 100 metres freestyle event at this year's Muscan Swimming Championships. They were divided randomly into 6 heats, with the fastest 16 qualifying for the semi-finals.These are the results of the 6 heats.From which heat was there only one qualifier for the semi-finals?

Accepted Answer

Heat 5

Answer

Heat 1

Answer

Heat 3

Answer

Heat 6

Question 8

The ingredients on a jar of mincemeat are in order of content by weight and are as follows:Sugar; Apples (26%); Vine fruit (26%); Candied mixed peel (4%); Vegetable suet; Treacle; Acetic Acid: Mixed spices (0.3%); Citric Acid; Antioxidant (Ascorbic Acid).To the nearest 1%, what is the possible range of sugar content?

Accepted Answer

26% to 44%

Answer

26% to 43%

Answer

31% to 43%

Answer

31% to 44%

Question 9

Tom needs to save some money to buy himself a new car. At the start of January there is $400 in his savings account. He is able to add $100 to the account at the end of each month.In April he knows that he will be paid a bonus and have an increase in his salary, so he needs to add $500 to his account at the end of April and then $150 each month of that.Which of the following graphs represents the total money that he will share in his savings account at the end of each month?

Accepted Answer

A

Answer

B

Answer

C

Answer

D

Question 10

A question-master asks each of four contestants up to 15 questions. The process is repeated again for a second round. The 'score' is the number of questions answered correctly. The scores after each round are announced in ascending numerical order.After the first round of a contest the scores were 8, 10, 11, and 14.After the second round the total scores for the contestants were 13, 18, 20, and 24.What was the largest possible score achieved in the second round of this contest?

Accepted Answer

14

Answer

10

Answer

11

Answer

16

Question 11

A rectangular piece of paper is folded in half and then folded in half the other way to produce a rectangle with sides half the lengths of those of the unfolded paper. Three corners of this folded paper are then cut off and the paper unfolded.Which one of the following could not be a representation of the paper when unfolded again?

Accepted Answer

A

Answer

B

Answer

C

Answer

D

Question 12

A display showing the 24-hour time (0000 to 2359) uses some or all of seven lights for each digit as follows:What is the greatest number of lights on at any time?

Accepted Answer

28

Answer

25

Answer

26

Answer

27

Question 13

In her first five weekly shopping trips on Saturdays, Angela spends $14, $7, $14, $7 respectively to ensure that she has enough stock of her new daily vitamin pill to last for the week without spending more than she needs to.Which one of the following would explain this variation?

Accepted Answer

The pills are sold in packets of 5

Answer

The pills are sold in packets of 4

Answer

The pills are sold in packets of 6

Answer

The pills are sold in packets of 7

Question 14

Four members of an online community construct a diagram to show whether they have ever met in real life. Each person is represented by a dot and two dots are jained together with a line if those two people have ever met in real life. The diagram looks like this:Each member of the group then makes a table, showing with a tick when two people have ever met in real life. Shaded cells show people linked to themselves. Which person's table is wrong?

Accepted Answer

C

Answer

A

Answer

B

Answer

D

Question 15

The Quiver family are planning to spend two consecutive days in Stratford to go to the theatres there. They are determined to see all four plays currently being presented. The weekly timela of plays is in the table below.Which two days should the family spend in Stratford?

Accepted Answer

Wednesday and Thursday

Answer

Monday and Tuesday

Answer

Thursday and Friday

Answer

Friday and Saturday

Question 16

I normally catch the 08:19 bus to work in the morning. Yesterday, I thought that I had arrived the bus stop 2 minutes too late and would have to wait for the later bus. However, my watch turned out to be 6 minutes fast and the 08:19 bus was running 3 minutes late.How long did I wait at the bus stop yesterday morning?

Accepted Answer

7 minutes

Answer

5 minutes

Answer

9 minutes

Answer

11 minutes

Question 17

The time on my clock has just changed to 03:45, showing four different digits.How long will it be until the next time the display shows four completely different digits, none of which is the same as those above?

Accepted Answer

12 hours 42 minutes

Answer

9 hours 22 minutes

Answer

12 hours 22 minutes

Answer

3 hours 12 minutes

Question 18

Bus routes 27, 37, and 47 all stop at Ferguson Square. Hamish was! sitting time and noted the order in which they arrived. Sometimes more than same time. The order was:On all the routes the buses are scheduled to arrive intervals, and they always keep to the timetable. Which one if the following would explain observed order?

Accepted Answer

The number 27 arrives at 6-minute intervals, the 37 at 10-minute intervals, and the 47 every 20 minutes

Answer

The number 27 arrives at 5-minute intervals, the 37 at 10-minute intervals, and the 47 every 20 minutes

Answer

The number 27 arrives at 9-minute intervals, the 37 at 15-minute intervals, and the 47 every 40 minutes

Answer

The number 27 arrives at 10-minute intervals, the 37 at 20-minute intervals, and the 47 every 30 minutes

Question 19

Four supermarkets are in competition and regularly have special offers on basic food products as a way of attracting customers. The latest promotion of special offers features 500-gram pots of yoghurt.Which supermarket's special offer will give the customer the lowest price per 500-gram yoghurt pot?

Accepted Answer

SAINSONS

Answer

ASCO

Answer

MORRISBY

Answer

TESDA

Question 20

Financial services usually have a disclaimer that past performance is no indicator of future returns, yet they also advertise using past performance. Which one of the following graphs is not consistent with the claim that "in most years the value of our unit bond has increased by over $10?

Accepted Answer

C

Answer

A

Answer

B

Answer

D

Free Scientific Reasoning MCQs with Answers