Question : Which of the following is a characteristic of an exothermic reaction:
Option 1: Release of heat
Option 2: Absorption of heat
Option 3: Doesn't involve any change in temperature
Option 4: None of the options is correct
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Correct Answer: Release of heat
Solution : The correct option is the Release of heat.
Exothermic reactions are those in which the system releases heat into the environment. The temperature of the surroundings rises because they are absorbing heat from the system. Respiration and burning of candles are examples of exothermic reactions.
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Question : Combustion of a candle is an
Option 1: photochemical reaction
Option 2: physical change
Option 3: endothermic reaction
Option 4: exothermic reaction
Question : Which one among the following doesn't have any effect on the velocity of sound?
Option 1: Pressure
Option 2: Temperature
Option 3: Humidity
Option 4: Density
Question : Find the part of the given sentence that has an error in it. If there is no error, choose "No error".
Just because I am quiet doesn't mean I can't scold you.
Option 1: Just because I am
Option 2: quiet doesn't mean
Option 3: I can't scold you.
Option 4: No error
Question : When quick lime is added to water
Option 1: Heat is liberated
Option 2: Heat is absorbed
Option 3: Temperature decreases
Option 4: No heat change takes place
Question : Identify the segment that contains a grammatical error. If there is no error, select 'No Error'. 'Don't you get / involve!' Sandhya / whispered urgently to him.
Option 1: whispered urgently to him
Option 2: involve!' Sandhya
Option 3: don't you get
Option 4: No Error
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