Raju

We have compiled the NCERT MCQ Questions for Class 7 Science Chapter 5 Acids, Bases and Salts with Answers Pdf free download covering the entire syllabus. Practice MCQ Questions for Class 7 Science with Answers on a daily basis and score well in exams. Refer to the Acids, Bases and Salts Class 7 MCQs Questions with Answers here along with a detailed explanation.

Acids, Bases and Salts Class 7 MCQs Questions with Answers

Choose the correct option.

Question 1.
Acids taste
(a) sour
(b) sweet
(c) bitter
(d) salty

Answer

Answer: (a) sour

---

Question 2.
Bases taste
(a) sweet
(b) sour
(c) bitter
(d) salty

Answer

Answer: (c) bitter

---

Question 3.
Colours of phenolphthalein indicator in acidic and basic medium, respectively are
(a) pink and colourless
(b) colourless and pink
(c) blue and red
(d) red and blue

Answer

Answer: (b) colourless and pink

---

Question 4.
The nature of bases is
(a) acidic
(b) basic
(c) neutral
(d) all of these

Answer

Answer: (b) basic

---

Question 5.
Which of the following feel soapy on touching?
(a) Acid
(b) Base
(c) Salt
(d) None of these

Answer

Answer: (b) Base

---

Question 6.
Which of the following is a natural indicator?
(a) China rose petal
(b) Turmeric
(c) Litmus
(d) All of these

Answer

Answer: (d) All of these

---

Question 7.
The most commonly used natural indicator is
(a) turmeric
(b) beetroot
(c) China rose petal
(d) litmus

Answer

Answer: (d) litmus

---

Question 8.
The correct way of making a solution of acid in water is to
(a) add water to acid
(b) add acid to water
(c) mix acid and water simultaneously
(d) add water to acid in a shallow container

Answer

Answer: (b) add acid to water

---

Question 9.
Which of the following is basic in nature?
(a) Lime water
(b) Baking soda
(c) Both (a) and (b)
(d) Lemon juice

Answer

Answer: (c) Both (a) and (b)

---

Question 10.
Litmus is extracted from
(a) curd
(b) grapes
(c) lichens
(d) cabbage

Answer

Answer: (c) lichens

---

Question 11.
Calcium hydroxide is found in
(a) window cleaner
(b) lime water
(c) soap
(d) lime juice

Answer

Answer: (b) lime water

---

Question 12.
On adding phenolphthalein indicator to a colourless solution, no change is observed. The nature of the solution may be
(a) acidic or basic
(b) basic
(c) acidic or neutral
(d) basic or neutral

Answer

Answer: (c) acidic or neutral

---

Question 13.
Neutralisation reactioñ is a
(a) physical and reversible change
(b) physical and irreversible change
(c) chemical and reversible change
(d) chemical and irreversible change

Answer

Answer: (d) chemical and irreversible change

---

Question 14.
When a drop of vinegar solution is put on the litmus paper, it turns
(a) red
(b) blue
(c) green
(d) yellow

Answer

Answer: (a) red

---

Question 15.
Tap water is
(a) acidic
(b) basic
(c) neutral
(d) depends on source

Answer

Answer: (d) depends on source

---

Question 16.
When phenolphthalein is added to a acidic solution, it gives
(a) pink colour
(b) red colour
(c) blue colour
(d) no colour

Answer

Answer: (d) no colour

---

Question 17.
A neutralisation reaction gives
(a) salt and water
(b) acid and salt
(c) base and salt
(d) acid and base

Answer

Answer: (a) salt and water

---

Question 18.
Our stomach contains
(a) hydrochloric acid
(b) sodium hydroxide
(c) sulphuric acid
(d) nitric acid

Answer

Answer: (a) hydrochloric acid

---

Question 19.
When we suffer from acidity, we should take
(a) iron tonic
(b) vitamins
(c) antacid
(d) lactocalamine

Answer

Answer: (c) antacid

---

Question 20.
When an ant bites, it injects
(a) acidic liquid
(b) basic liquid
(c) both (a) and (b)
(d) neutral liquids

Answer

Answer: (a) acidic liquid

---

Question 21.
Substances that have sour taste and turn blue litmus red are called
(a) acids
(b) bases
(c) salts
(d) water

Answer

Answer: (a) acids

---

Question 22.
Acid used in eye wash is
(a) carbonic acid
(b) acetic acid
(c) benzoic acid
(d) boric acid

Answer

Answer: (d) boric acid

---

Question 23.
Acid which is used as a source of vitamin C is
(a) citric acid
(b) carbonic acid
(c) boric acid
(d) tartaric acid

Answer

Answer: (a) citric acid

---

Question 24.
A base which is used for removing grease and stains from woollen clothes is
(a) ammonium hydroxide
(b) magnesium hydroxide
(c) sodium hydroxide
(d) calcium hydroxide

Answer

Answer: (a) ammonium hydroxide

---

Question 25.
Neutralisation is a reaction between
(a) two acids
(b) two bases
(c) one acid and one base
(d) one acid and one neutral substance

Answer

Answer: (c) one acid and one base

---

Question 26.
Sting of an ant contains
(a) vinegar
(b) common salt
(c) formic acid
(d) milk of magnesia

Answer

Answer: (c) formic acid

---

Question 27.
Lime water turns
(a) red litmus into blue
(b) blue litmus to red
(c) no change
(d) can’t predict

Answer

Answer: (a) red litmus into blue

---

Question 28.
Common salt is
(a) acidic
(b) basic
(c) neutral
(d) none of these

Answer

Answer: (c) neutral

---

Question 29.
Milk of magnesia is used as antacid because
(a) it is acidic
(b) it is basic
(c) it is neutral
(d) all of above

Answer

Answer: (b) it is basic

---

Question 30.
Colour of phenolphthalein in acidic solution is
(a) colourless
(b) pink
(c) yellow
(d) orange

Answer

Answer: (a) colourless

---

Question 31.
Process in which acids and bases react to form salt and water is called
(a) neutralisation
(b) hydrogenation
(c) sublimation
(d) all of these

Answer

Answer: (a) neutralisation

---

Fill in the blanks with suitable word/s.

Question 1.
…………….. can cause damage to historical monuments, marble, statues, plants and animals.

Answer

Answer: Acid rain

---

Question 2.
…………….. helps to relieve indigestion.

Answer

Answer: Antacid

---

Question 3.
Organic matters release ……………..

Answer

Answer: acids

---

Question 4.
Salt may be …………….., …………….. or …………….. in nature.

Answer

Answer: acidic, basic, neutral

---

Question 5.
Plants do not grow well when the soil is either too …………….. or too ……………..

Answer

Answer: acidic, basic

---

Question 6.
When an ant bites, it injects …………….. acid.

Answer

Answer: formic

---

Question 7.
Detergent solution is …………….. substance.

Answer

Answer: basic

---

Question 8.
Chemical name of chuna is ……………..

Answer

Answer: calcium oxide

---

Question 9.
Phenolphthalein is a …………….. indicator.

Answer

Answer: man-made

---

Question 10.
The word acid comes from the Latin word …………….. which means ……………..

Answer

Answer: acere, sour

---

Question 11.
Citrus fruits contain …………….. acid.

Answer

Answer: citric

---

Question 12.
Milk of magnesia helps to …………….. food.

Answer

Answer: digest

---

Question 13.
China rose turns acidic solution …………….. and basic solution ……………..

Answer

Answer: dark pink, green

---

Question 14.
Spinach contains …………….. acid.

Answer

Answer: oxalic

---

Question 15.
Sugar is …………….. in nature.

Answer

Answer: neutral

---

Question 16.
are used to identify the nature of substances.

Answer

Answer: Indicators

---

Question 17.
Bases are to taste.

Answer

Answer: bitter

---

Question 18.
Acids are to taste.

Answer

Answer: sour

---

Question 19.
Antacid tablets contain which neutralise the excess acid formed in our body.

Answer

Answer: base

---

Question 20.
is the reaction between acid and base to form salt and water.

Answer

Answer: Neutralisation

---

Question 21.
If China rose indicator is added to a basic solution, it turns .

Answer

Answer: green

---

Question 22.
Lime water is in nature.

Answer

Answer: basic

---

True or False

Question 1.
Curd is a base.

Answer

Answer: False

---

Question 2.
Lime juice tastes sour.

Answer

Answer: True

---

Question 3.
Turmeric is a man-made indicator.

Answer

Answer: False

---

Question 4.
China rose petal is a natural indicator.

Answer

Answer: True

---

Question 5.
Litmus is called a natural dye.

Answer

Answer: True

---

Question 6.
Lactic acid is found in lemons.

Answer

Answer: False

---

Question 7.
Sodium/Potassium hydroxide is found in soap.

Answer

Answer: True

---

Question 8.
Litmus paper is available as red and yellow colour.

Answer

Answer: False

---

Question 9.
Litmus paper turns an acidic solution red and basic solution blue.

Answer

Answer: True

---

Question 10.
When added to a basic solution, phenolphthalein gives pink colour.

Answer

Answer: True

---

Question 11.
When the soil is too acidic, it is treated with bases like quick lime.

Answer

Answer: True

---

Question 12.
Organic matter releases acids.

Answer

Answer: True

---

Question 13.
A salt is formed when an acid and a base neutralise each other.

Answer

Answer: True

---

Question 14.
Acids turn blue litmus red.

Answer

Answer: True

---

Question 15.
Bases turn red litmus green.

Answer

Answer: False

---

Question 16.
Indicators bring about colour change in colour of a substance.

Answer

Answer: True

---

Question 17.
Soluble bases are known as alkali.

Answer

Answer: True

---

Question 18.
Phenolphthalein gives pink colour with acids.

Answer

Answer: False

---

Question 19.
Solutions which do not change the colour of an indicator are known as acidic solutions.

Answer

Answer: False

---

Question 20.
Turmeric contains a natural dye of yellow colour.

Answer

Answer: True

---

Question 21.
Acids produce hydroxide ions when dissolved in water.

Answer

Answer: False

---

Question 22.
Acids are bitter in taste.

Answer

Answer: False

---

Question 23.
Sting of an ant contains vinegar.

Answer

Answer: False

---

Match the Following

Column I	Column II
1. Tartaric acid	(a) Soap
2. Calcium hydroxide	(b) Oranges
3. Formic acid	(c) Vinegar
4. Citric acid	(d) Lime water
5. Lactic acid	(e) Tamarind
6. Sodium hydroxide	(f) Window cleaner
7. Oxalic acid	(g) Milk of magnesia
8. Ammonium hydroxide	(h) Curd
9. Acetic acid	(i) Ant’s sting
10. Magnesium hydroxide	(j) Spinach

Answer

Answer:

Column I	Column II
1. Tartaric acid	(e) Tamarind
2. Calcium hydroxide	(d) Lime water
3. Formic acid	(i) Ant’s sting
4. Citric acid	(b) Oranges
5. Lactic acid	(h) Curd
6. Sodium hydroxide	(a) Soap
7. Oxalic acid	(j) Spinach
8. Ammonium hydroxide	(f) Window cleaner
9. Acetic acid	(c) Vinegar
10. Magnesium hydroxide	(g) Milk of magnesia

---

Column A	Column B
1. Vinegar	(a) Salt
2. Fertiliser	(b) Basic
3. Sodium chloride	(c) Magnesium hydroxide
4. Lime water	(d) Acetic acid
5. Milk of magnesia	(e) Potassium nitrate

Answer

Answer:

Column A	Column B
1. Vinegar	(d) Acetic acid
2. Fertiliser	(e) Potassium nitrate
3. Sodium chloride	(a) Salt
4. Lime water	(b) Basic
5. Milk of magnesia	(c) Magnesium hydroxide

---

Hope the information shed above regarding NCERT MCQ Questions for Class 7 Science Chapter 5 Acids, Bases and Salts with Answers Pdf free download has been useful to an extent. If you have any other queries of CBSE Class 7 Science Acids, Bases and Salts MCQs Multiple Choice Questions with Answers, feel free to reach us so that we can revert back to us at the earliest possible.

We have compiled the NCERT MCQ Questions for Class 12 Physics Chapter 3 Current Electricity with Answers Pdf free download covering the entire syllabus. Practice MCQ Questions for Class 12 Physics with Answers on a daily basis and score well in exams. Refer to the Current Electricity Class 12 MCQs Questions with Answers here along with a detailed explanation.

Current Electricity Class 12 MCQs Questions with Answers

Question 1.
Kirchhoff s second law is based on the law of conservation of
(a) charge
(b) mass
(c) energy
(d) momentum

Answer

Answer: (c) energy

---

Question 2.
When there is an electric current through a conducting wire along its length, then an electric field must exist:
(a) outside the wire but normal to it.
(b) inside the wire but parallel to it.
(c) inside the wire but normal to it.
(d) outside the wire but around it.

Answer

Answer: (b) inside the wire but parallel to it.

---

Question 3.
The terminal potential difference of a cell when short circuited is
(a) zero
(b) E
(c) \(\frac {E}{2}\)
(d) \(\frac {E}{3}\)

Answer

Answer: (a) zero

---

Question 4.
A cell of e.m.f. ‘E’ and internal resistance r is connected in series with an external resistance nr. Then the ratio of the terminal potential difference to e.m.f. is
(a) \(\frac {1}{n}\)
(b) \(\frac {1}{n+1}\)
(c) \(\frac {n}{n+1}\)
(d) \(\frac {n+1}{n}\)

Answer

Answer: (c) \(\frac {n}{n+1}\)

---

Question 5.
For which of the following dependence of drift velocity electric field E is Ohm’s law obeyed.
(a) v_d < √E
(b) v_d ∝ E
(c) v_d ∝ E²
(d) v_d = constant

Answer

Answer: (b) v_d ∝ E

---

Question 6.
In 10 minutes, 3000 Coulombs of free electrons enter one end of a conductor and 3000 Coulomb of then leave the conductor at its other end. The current in the conductor is:
(a) 5 A
(b) 10 A
(c) 0 A
(d) 30 A

Answer

Answer: (a) 5 A

---

Question 7.
A current I flows in a wire of circular cross-section with the free electrons travelling with a drift velocity v. The drift velocity of electrons when a current 21 flows in another wire of twice radius and of the same material is:
(a) \(\frac {v}{2}\)
(b) v
(c) 2v
(d) √2 v

Answer

Answer: (a) \(\frac {v}{2}\)

---

Question 8.
Three equal registers connected in series across a source of e.m.f. together dissipate 10 watts of power. What would be the power dissipated if the same resistors are connected in parallel across the same source of e.m.f.?
(a) 9 watts
(b) 90 watts
(c) 10 watts
(d) 100 watts

Answer

Answer: (b) 90 watts

---

Question 9.
The temperature coefficient of resistance of a wire is 0.00125° C^-1. At 27°C, its resistance is 1Ω. The temperature of the wire at which its resistance becomes 2Ω is:
(a) 1400 K
(b) 854°C
(c) 1127 K
(d) 1154 K.

Answer

Answer: (b) 854°C

---

Question 10.
The heating element of an electric heater should be made of a material that should have:
(a) low specific resistance and low melting point.
(b) high specific resistance and high melting point.
(c) high specific resistance and low melting point.
(d) low specific resistance and high melting point.

Answer

Answer: (b) high specific resistance and high melting point.

---

Question 11.
The effective wattage of 60 W and 40 W lamps connected in: (A) series is equal to:
(a) 24 W
(b) 20 W
(c) 100 W
(d) 80 W.

Answer

Answer: (a) 24 W

---

(B) parallel is equal to:
(a) 24 W
(b) 20 W
(c) 100 W
(d) 80 W

Answer

Answer: (c) 100 W

---

Question 12.
In an experiment to measure the internal resistance of a cell by a potentiometer, it is found that the balance point is at a length of 2 m, when the cell is shunted by a 5Ω resistance and is at 3 m when the cell is shunted by a 10Ω resistance. The internal resistance of the cell is:
(a) 10 Ω
(b) 15 Ω
(c) 1 Ω
(d) 1.5 Ω

Answer

Answer: (a) 10 Ω

---

Fill in the Blanks

Question 1.
For ‘n’ identical resistances, the ratio of the total resistances of series combination to the total resistance of parallel combination is ……………….

Answer

Answer: \(\frac {R_s}{R_p}\) = n²

---

Question 2.
The drift velocity of electron is of the order of ………………. while the thermal average thermal velocity of the electron at room temperature is ……………….

Answer

Answer: 10^-5 ms^-1, 10⁵ to 10⁶ ms^-1.

---

Question 3.
The temperature coefficient of resistance lies between ………………. to ………………. °C^-1

Answer

Answer: 10^-2, 10^-4

---

Question 4.
Manganin has a resistance which is ………………. taken as compared to pure copper and its temperature coefficient is ………………. °C^-1.

Answer

Answer: 30 to 40, 10^-5

---

Question 5.
The resistivity of a conductor depends upon the nature of the material of the conductor but is independent of the ……………….

Answer

Answer: Physical dimensions i.e., length and area of cross-section of the conductor.

---

Question 6.
The direction of current inside the cell is from ………………. electrode but outside the cell, it is from ………………. electrode.

Answer

Answer: negative to positive electrode, positive to negative electrtode.

---

Question 7.
The terminal potential difference of a cell is zero when the potential drop across its internal resistance is ………………. while for the cell to be in open circuit the terminal P.D. is ……………….

Answer

Answer: equal to the e.m.f. of the cell, equal to tfie e.m.f. fo the cell.

---

Question 8.
In order to get a large amount of current from the cells connected in series, the external resistance should be ……………….

Answer

Answer: Very large as compared to the net internal resistance of the cells.

---

Question 9.
In order to get the maximum current in the circuit, the mixed grouping of cells must be done in such a way that the external resistance is ……………….

Answer

Answer: equal to the net (effective) internal resistance of all the cells.

---

Question 10.
Nichrome is an alloy of ………………., ………………. and ……………….

Answer

Answer: Ni, Cu, Cr.

---

Question 11.
Commercial unit of electrical energy is ………………. and is ………………. times the J.

Answer

Answer: KWh or B.O.T. unit or simply unit, 3.6 × 10⁶.

---

Question 12.
For the wheatstone bridge to be balanced, the necessary conditions for the four resistances is ……………….

Answer

Answer: \(\frac {P}{Q}\) = \(\frac {R}{X}\)

---

Question 13.
For a potentiometer, the ratio of the e.m.f.s of two cells is ……………….

Answer

Answer: equal to the ratio of the balancing lengths for the two cells i.e., mathematically, \(\frac {E_1}{E_2}\) = \(\frac {l_1}{l_2}\).

---

Question 14.
For insulators, the resistance ………………. with the increase in temperature.

Answer

Answer: increases.

---

Question 15.
The relation ………………. is used when supplied electric power is lost or dissipated as heat.

Answer

Answer: P = I²R.

---

Question 16.
The equivalent resistance of a network ………………. due to parallel grouping of resistances and becomes ……………….

Answer

Answer: decrease, lesser than the least resistance in the network.

---

Hope the information shed above regarding NCERT MCQ Questions for Class 12 Physics Chapter 3 Current Electricity with Answers Pdf free download has been useful to an extent. If you have any other queries of CBSE Class 12 Physics Current Electricity MCQs Multiple Choice Questions with Answers, feel free to reach us so that we can revert back to us at the earliest possible.

We have compiled the NCERT MCQ Questions for Class 8 Geography Chapter 5 Industries with Answers Pdf free download covering the entire syllabus. Practice MCQ Questions for Class 8 Geography with Answers on a daily basis and score well in exams. Refer to the Industries Class 8 MCQs Questions with Answers here along with a detailed explanation.

Industries Class 8 MCQs Questions with Answers

Question 1.
With limited capital, a food processing unit is set up in a particular village in Gujarat. This unit generates employment to that particular village. Name the type of classification of industry under which this food processing unit will come under.
(a) Forest based industry
(b) Agro based industry
(c) Small Scale industry
(d) Large Scale industry

Answer

Answer: (c) Small Scale industry

---

Question 2.
____________ sector industries are owned, managed and controlled by the state or central government .
(a) Cooperative
(b) Public
(c) Joint
(d) Private

Answer

Answer: (b) Public

---

Question 3.
Which of the following can be considered as an example of the economic activity extraction of minerals from the industry sector?
(a) Tourism industry
(b) Iron and Steel industry
(c) Banking industry
(d) Coal mining industry

Answer

Answer: (d) Coal mining industry

---

Question 4.
Joint sector Industries are owned and operated by the state and individuals or a group of individuals. From the given list fo industries, which one can be called a Joint sEctor industry?
(a) Iron and Steel industry
(b) Tata Group of Companies
(c) Reliance Industries
(d) Maruti Udyog Limited

Answer

Answer: (d) Maruti Udyog Limited

---

Question 5.
Name the important Northern industrial region in India
(a) Delhi ,Gurgaon- Meerut region
(b) Bangalore- Tamil Nadu region
(c) Ahmedabad- Vadodara region
(d) Damodar Valley belt

Answer

Answer: (a) Delhi ,Gurgaon- Meerut region

---

Question 6.
Fish is a product of the
(a) mineral-based industries
(b) agro-based industries
(c) marine-based industries
(d) forest-based industries

Answer

Answer: (c) marine-based industries

---

Question 7.
Basket weaving falls in the category of
(a) Small-scale industry
(b) Cottage industry
(c) Large-scale industry
(d) None of these

Answer

Answer: (b) Cottage industry

---

Question 8.
In the light of various factors that influence industrial location, some industries have a tendency to grow close to each other. Name such areas.
(a) Industrial Structures
(b) Industrial Regions
(c) Industrial Systems
(d) Industrial Organisms

Answer

Answer: (b) Industrial Regions

---

Question 9.
Which of the following best describes an agro based industry?
(a) Industries depending on ores like Cement, iron and steel etc.
(b) Industries that depend upon the primary products from forests for their raw materials
(c) Industries depending on agricultural products ie plant and animal products
(d) Industries that use products from the sea and oceans as raw materials

Answer

Answer: (c) Industries depending on agricultural products ie plant and animal products

---

Question 10.
To which category of industry (based on raw materials) does Iron made from iron ore belong to?
(a) Marine based
(b) Forest based
(c) Agro based
(d) Mineral based

Answer

Answer: (d) Mineral based

---

Question 11.
Name the three important industrial regions of the world.
(a) Eastern North America, Western and Central Europe, Eastern Asia
(b) Eastern Australia, Western and central Europe, Eastern Asia
(c) Eastern North America, Western and Central Europe, Western Australia
(d) Africa, Eastern Asia, Central Australia

Answer

Answer: (a) Eastern North America, Western and Central Europe, Eastern Asia

---

Question 12.
Which of the following can be considered as an example of the economic activity service provider from the industry sector?
(a) Textile industry
(b) Banking industry
(c) Iron and Steel industry
(d) Coal mining industry

Answer

Answer: (b) Banking industry

---

Question 13.
Processing sea food and manufacturing fish oil can be considered as examples of :
(a) Agro based industries
(b) Marine based industries
(c) Mineral based industries
(d) Forest based industries

Answer

Answer: (b) Marine based industries

---

Question 14.
Which industries are also known as village or household industries?
(a) Small Scale industries
(b) Cottage industries
(c) Large Scale industries
(d) None of the above

Answer

Answer: (b) Cottage industries

---

Question 15.
Why is steel called the backbone of modern industries?
(a) Everything we use is related with steel
(b) Steel is cheaper
(c) Steel is available everywhere in the world
(d) None of these

Answer

Answer: (a) Everything we use is related with steel

---

Question 16.
Change of raw materials into products of more value to people is called
(a) Manufacturing
(b) Resources
(c) Population
(d) None of these

Answer

Answer: (a) Manufacturing

---

Question 17.
The leading industries of Birla Group, Reliance, Tata Group of industries belong to the private sector. What are the characterstic fetures of these industries?
(a) Jointly owned, they are owned, managed and controlled by a group of individuals and govenrment agencies. Prices of products are fixed through planning.
(b) Operated mainly for the benefit of the public rather than profits, they are owned, managed and controlled by a group of individuals. Prices of products are determined by market forces
(c) Operated mainly for Profits, they are owned, managed and controlled by a group of individuals. Prices of products are determined by market forces
(d) Members of the cooperative society produce the raw material and add value to earn profit. Generally opearetes with the motive of community welfare

Answer

Answer: (c) Operated mainly for Profits , they are owned, managed and controlled by a group of individuals. Prices of products are determined by market forces

---

Question 18.
Marine-based industries are based on
(a) Minerals
(b) Forest products
(c) Agricultural products
(d) Oceanic products

Answer

Answer: (d) Oceanic products

---

Hope the information shed above regarding NCERT MCQ Questions for Class 8 Geography Chapter 5 Industries with Answers Pdf free download has been useful to an extent. If you have any other queries of CBSE Class 8 Geography Industries MCQs Multiple Choice Questions with Answers, feel free to reach us so that we can revert back to us at the earliest possible.