Arihant Expert Team Solutions for Exercise 2: Previous Years' Questions
Arihant Expert Team Science & Pedagogy Solutions for Exercise - Arihant Expert Team Solutions for Exercise 2: Previous Years' Questions
Attempt the free practice questions from Exercise 2: Previous Years' Questions with hints and solutions to strengthen your understanding. Science and Pedagogy CTET and TETs solutions are prepared by Experienced Embibe Experts.
Questions from Arihant Expert Team Solutions for Exercise 2: Previous Years' Questions with Hints & Solutions
In order to determine the acidic, basic or neutral character of solutions, a student tabulated the following results after experimentation. Which of the following observations has been tabulated correctly?
| Case | Test Solution | Color Change on red litmus paper | Color change on blue litmus paper | Acidic/Basic/ Neutral |
| A | No change | Red | Acidic | |
| B | Lime water | Red | No change | Neutral |
| C | Vinegar | No change | No change | Neutral |
| D | Washing Soda | Blue | No change | Basic |
The following observations were made by students A, B, C, and D when they rubbed solid baking soda on dry litmus paper.
| Student | Effect on dry red litmus paper | Effect on dry litmus paper |
| A | Color changed to blue | No change |
| B | No change | Color changed to red |
| C | Color changed to blue | Color changed to red |
| D | No change | No change |
The correct observation was made by _____.
Match List I with List II and choose the correct answer from the codes given below the lists:
| List I( Ploymer) | List II (Monomer) |
| A. PAN | 1. Chloroethene |
| B. Natural rubber | 2. Caprolactam |
| C. Nylon-6 | 3. Isoprene |
| D. PVC | 4. Acrylonitrile |
Codes
A, B, C, D
Each cell in our body contains DNA. We also have proteins and fats in our body. What is common among DNA, proteins, and fats?
Identify the incorrect statement:
1. Acids are sour in taste whereas bases are bitter in taste and soapy to touch.
2. Acids turn blue litmus red and bases turn red litmus blue.
3. Solutions of substances that show different colors in acidic, basic and neutral solutions are called indicators.
4. An acid and a base neutralize each other to form a salt and a salt is always neutral.
You have three test tubes X, Y and Z half-filled with different solutions, as X is filled with sodium chloride solution, Y is filled with sodium hydroxide solution and Z is filled with dilute hydrochloric acid. On adding one drop of phenolphthalein solution to each of the above solutions, you would observe the solutions in the test tubes as _____.
A teacher of class VIII demonstrates the following activity in her class: The teacher takes a small amount of sulphur in a spoon and burns it. She then puts the spoon into a tumbler with a lid to ensure that the gas produced does not escape. After a few minutes, she adds water to the tumbler. What happens, if blue and red litmus papers are put into the tumbler?
Select the true statement from the following:
