Asked | Gurucool - Coolfluencing the world

Class 6	Science Mathematics Social Science	English Hindi Computer
Class 7	Science Mathematics Social Science	English Hindi Computer
Class 8	Science Mathematics Social Science	English Hindi Computer
Class 9	Science Mathematics Social Science	English Hindi Computer
Class 10	Science Math Social Science	English Hindi Computer
Class 11	Physics Chemistry Biology	Mathematics English Economics
Class 12	Physics Chemistry Biology	Mathematics English Economics
Class 5	EVS
College Entrance	Jamia Millia Islamia Aligarh Muslim University Banaras Hindu University

2020

Q11
8. When a small amount of acid is added to water, the phenomena which occur are:
(A) Dilution
(B) Neutralisation
(C) Formation of H₃O⁺
(D) Salt formation
The correct statements are:

Solution

Solution

Q13
10. At the time of short circuit, the electric current in the circuit:

Solution

Q14
11. Calcium oxide reacts vigorously with water to produce slaked lime.
CaO (s) + H₂O (l) →Ca(OH)₂ (aq)
This reaction can be classified as :
(A) Combination reaction
(B) Exothermic reaction
(C) Endothermic reaction
(D) Oxidation reaction
Which of the following is a correct option?

Solution

Q15
12. In a double displacement reaction such as the reaction between sodium sulphate solution and barium chloride solution:
(A) exchange of atoms takes place
(B) exchange of ions takes place
(C) a precipitate is produced
(D) an insoluble salt is produced
The correct option is:

Solution

Q16
13. Assertion (A): Esterification is a process in which a sweet smelling substance is produced.
Reason (R): When esters react with sodium hydroxide an alcohol and sodium salt of carboxylic acid are obtained.

Solution

Q17
14. Assertion (A): A solar cooker cooks the meal due to green house effect.
Reason (R): The plane mirror is responsible for producing the green house effect.

Solution

Q18
15. (a) Write the mathematical expression for Joule's law of heating.

Solution

Q19
15. (b) Compute the heat generated while transferring 96000 coulombs of charge in two hours through a potential difference of 40 V.

Solution

Q20
16. Draw a labelled diagram to show (i) reddish appearance of the sun at the sunrise or the sunset and (ii) white appearance of the sun at noon when it is overhead.

Solution

Subjects

2020

Q11 8. When a small amount of acid is added to water, the phenomena which occur are: (A) Dilution (B) Neutralisation (C) Formation of H₃O⁺ (D) Salt formation The correct statements are:

Solution

Solution

Q13 10. At the time of short circuit, the electric current in the circuit:

Solution

Q14 11. Calcium oxide reacts vigorously with water to produce slaked lime. CaO (s) + H₂O (l) →Ca(OH)₂ (aq) This reaction can be classified as : (A) Combination reaction (B) Exothermic reaction (C) Endothermic reaction (D) Oxidation reaction Which of the following is a correct option?

Solution

Q15 12. In a double displacement reaction such as the reaction between sodium sulphate solution and barium chloride solution: (A) exchange of atoms takes place (B) exchange of ions takes place (C) a precipitate is produced (D) an insoluble salt is produced The correct option is:

Solution

Q16 13. Assertion (A): Esterification is a process in which a sweet smelling substance is produced. Reason (R): When esters react with sodium hydroxide an alcohol and sodium salt of carboxylic acid are obtained.

Solution

Q17 14. Assertion (A): A solar cooker cooks the meal due to green house effect. Reason (R): The plane mirror is responsible for producing the green house effect.

Solution

Q18 15. (a) Write the mathematical expression for Joule's law of heating.

Solution

Q19 15. (b) Compute the heat generated while transferring 96000 coulombs of charge in two hours through a potential difference of 40 V.

Solution

Q20 16. Draw a labelled diagram to show (i) reddish appearance of the sun at the sunrise or the sunset and (ii) white appearance of the sun at noon when it is overhead.

Solution

Subjects

Q11
8. When a small amount of acid is added to water, the phenomena which occur are:
(A) Dilution
(B) Neutralisation
(C) Formation of H₃O⁺
(D) Salt formation
The correct statements are:

Q13
10. At the time of short circuit, the electric current in the circuit:

Q14
11. Calcium oxide reacts vigorously with water to produce slaked lime.
CaO (s) + H₂O (l) →Ca(OH)₂ (aq)
This reaction can be classified as :
(A) Combination reaction
(B) Exothermic reaction
(C) Endothermic reaction
(D) Oxidation reaction
Which of the following is a correct option?

Q15
12. In a double displacement reaction such as the reaction between sodium sulphate solution and barium chloride solution:
(A) exchange of atoms takes place
(B) exchange of ions takes place
(C) a precipitate is produced
(D) an insoluble salt is produced
The correct option is:

Q16
13. Assertion (A): Esterification is a process in which a sweet smelling substance is produced.
Reason (R): When esters react with sodium hydroxide an alcohol and sodium salt of carboxylic acid are obtained.

Q17
14. Assertion (A): A solar cooker cooks the meal due to green house effect.
Reason (R): The plane mirror is responsible for producing the green house effect.

Q18
15. (a) Write the mathematical expression for Joule's law of heating.

Q19
15. (b) Compute the heat generated while transferring 96000 coulombs of charge in two hours through a potential difference of 40 V.

Q20
16. Draw a labelled diagram to show (i) reddish appearance of the sun at the sunrise or the sunset and (ii) white appearance of the sun at noon when it is overhead.