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A person has sour taste in the mouth and a burning sensation of the stomach.
- What is he suffering from?
- Why does it happen?
- What substance is used as a remedy?
Concept: Acids, Bases and Their Reactivity
The litmus paper or the litmus solution is obtained from ________ plant
(A) Moss
(B) Lichen
(C) Rose
(D) Hibiscus
Concept: Properties of Acids > Physical Properties
Which substance when used with butter having butyric acid can cure acidity?
(A) Lime water
(B) Soda water
(C) Calcium carbonate
(D) Lime juice
Concept: Acids, Bases and Their Reactivity
Write the chemical name of bleaching powder and write its properties.
Concept: Important Salts in Daily Life >> Preparation and Uses of Bleaching Powder
Lime water turns milky when ______ gas is passed through it.
Concept: Acid or a Base in a Water Solution
Phenolphthalein is a synthetic type of indicator.
Concept: Properties of Acids > Physical Properties
Choose the correct alternative and rewrite the following sentence.
Phenolphthalein is ___________ type of indicator.
Concept: Properties of Acids > Physical Properties
When _______________ is passed through fresh lime water, it turns milky.
Concept: Properties of Acids > Physical Properties
Answer the following question:
What is the universal indicator? Does Mg (OH)2 react with sodium hydroxide? If not, why?
Concept: Properties of Acids > Physical Properties
In series combination which remains constant?
(a) Voltage
(b) Current
(c) Both current and voltage
(d) Both are variables
Concept: Resistance of a System of Resistors >> Resistors in Series
Find the expression for the resistors connected in series and write the two characteristics of it. (Draw figure).
Concept: Resistance of a System of Resistors >> Resistors in Series
If the potential difference across the ends of a conductor is 220 V and the resistance of the conductor is 44 Ω (ohm), then the current flowing through is _________.
- 0.2 A
- 0.5 A
- 2 A
- 5 A
Concept: Ohm's Law
Differentiate between resistances in series and parallel.
Concept: Resistance of a System of Resistors >> Resistors in Parallel
State four most common electrical appliances based on heating effect of electric current. Why do we use finely heated platinum wire in surgery?
Concept: Heating Effect of Electric Current
Complete the following :-
(a)

Concept: Resistance of a System of Resistors >> Resistors in Series
Complete the following :-
(b)

Concept: Resistance of a System of Resistors >> Resistors in Parallel
Complete the following :-
(c)

Concept: Resistance of a System of Resistors >> Resistors in Parallel
What will be the change in the current if the potential difference is kept constant and the resistance of the circuit is made four times?
- It will remain unchanged.
- It will become four times.
- It will become one-fourth.
- It will become half.
Concept: Ohm's Law
If the equivalent resistance is to be increased, then the number of resistances should be connected in
- Series
- Parallel
- Mixed arrangement
- None of the above
Concept: Resistance of a System of Resistors >> Resistors in Series
Find the resistance of a conductor if 0.24 A current is passing through it and a potential difference of 24 V is applied across it.
Concept: Ohm's Law
