Science

Question 1

Amla

Answer 1

Acidic

Question 2

Acid-base indicator

Answer 2

Show different colours when in acid or basic

Question 3

Lichen

Answer 3

Association of Alga and fungi grow on rock and trees and in regions with rainfall and clean air

Question 4

Acidic substances

Answer 4

Taste sour turn blue litmus to red

Question 5

basic

Answer 5

Taste bitter, turn red litmus to blue

Question 6

Neutral

Answer 6

Neither Acidic nor basic, give no change

Question 7

Lemon juice

Answer 7

Citric Acid

Question 8

Amla

Answer 8

Absorbic and citric acid

Question 9

unripe mangoes

Answer 9

tartaric acid

Question 10

Tomatoes

Answer 10

Citric and oxalic

Question 11

Curd

Answer 11

Lactic

Question 12

Tamarind

Answer 12

Tatric

Question 13

Vinegar

Answer 13

Acitic

Question 14

Termaric

Answer 14

Curcumin

Question 15

Preparation of Rose Extract

Answer 15

Crush petals of rose and put them in hot water. Filter coloured water, the filtrate is the extract

Question 16

Name other substances that can be used as indicators

Answer 16

Beetroot, Purple Cabbage, turmeric, Jamun, red Hibiscus

Question 17

Explain Hydrangea

Answer 17

Cooler climates, like Himalayan Region, color flowers change depending on the nature of soil. Acidic soli then the color is blue in basic soil the color is red

Question 18

Explain turmeric Paper indicator

Answer 18

Only differentiate between basic substances not acid or neutral

Question 19

Explain turmeric

Answer 19

Golden Spice, member of Ginger family which is grown in India. Common spice in daily household, with benefits such as health benefits and home remedies

Question 20

Olfactory indicators

Answer 20

Substances that change odour in Acidic or basic.

Question 21

Father of Modern Indian Chemistry

Answer 21

Acharya Prafulla Chandra Ray, “Achar Khane ke liye Prafulla ji ne Chandra ke rays dekhi”

Question 22

Neutralisation

Answer 22

Process in which bases and acids react to neutralize each others properties, it releases salt, water and heat

Question 23

Why is soil acidic

Answer 23

Excessive use of chemical fertilizers

Question 24

Treatment of acidic soil

Answer 24

Base like Lime

Question 25

Treatment of basic soil

Answer 25

Organic matter

Question 26

Why plants grow poorly even in neutral soil?

Answer 26

Because of deficiency of neutrients

Question 27

Positive Terminal differentiation

Answer 27

Small, protuding cap

Question 28

Negative Terminal DIfferentiation

Answer 28

Flat, metal disk

Question 29

Electric cell utility

Answer 29

Portable

Question 30

Battery

Answer 30

Combination of two or more cells

Question 31

Connecting two or more cells

Answer 31

More time, energy

Question 32

Why is battery sometimes called "one cell"

Answer 32

Mobile only has one cell but it is still called a battery

Question 33

What is filament

Answer 33

Thin wire inside glass bulb which glows to produce light when hot

Question 34

LED

Answer 34

Light Emitting Diode

Question 35

Electric Circuit

Answer 35

One terminal connected to other terminal, it gives path for electricity to flow from one terminal to other

Question 36

Similarity and difference between Light bulb and LED

Answer 36

LED no filament while bulb has, both have two terminals

Question 37

How does current flow in incandescent lamp?

Answer 37

When both terminals of bulb are connected to the battery, the current flows from positive to negative. It does not matter if positive is connected negative or positive is connected to positive, regardless the bulb will flow

Question 38

What happens when the circuit is complete?

Answer 38

When the circuit is complete, circuit is said to be ON, the circuit is closed

Question 39

What happens when the circuit is not complete?

Answer 39

When the circuit is not complete, The circuit is OFF, which means that the circuit is open.

Question 40

Where can a switch be placed

Answer 40

Anywhere on circuit

Question 41

What is switch

Answer 41

A device which completes or breaks a circuit.

Question 42

What is the triangle and the arrows on the symbol of LED mean?

Answer 42

Triangle shows the direction current an the arrows show that the LED is emitting light

Question 43

What is Circuit diagram?

Answer 43

Circuit diagram is a representation of electric circuit using symbols

Question 44

Why is copper used over other metals

Answer 44

It is abundant, low cost

Question 45

What is AC?

Answer 45

Alternating Current, Comes from wall socket through power plants , run larger devices

Question 46

What is DC?

Answer 46

Direct Current, comes from batteries, power small devices