SCIENCE QUIZ 10

Why do echoes occur in large empty spaces?

•  Sound waves are absorbed after hitting a surface

• • Sound waves bounce back after hitting a surface

• Air amplifies the sound and generates echoes

• The speed of sound increases and hence echoes occur

Why do hybrid cars use both a gasoline engine and an electric motor ?

• • To switch between energy sources for improved efficiency and lower emissions

• • To increase the speed 

• • To reduce the car's weight

• • To generate electricity from the engine 

How do gyroscopes help stabilize drones or aircraft ?

• • By creating magnetic fields and maintaining orientation due to angular momentum

• • By spinning rapidly and maintaining orientation due to angular momentum

• • By reflecting light and maintaining orientation due to angular momentum

• • By absorbing air resistance and maintaining orientation due to angular momentum

Why is universal indicator a better indicator to use than litmus indicator?

• 1. Universal indicator gives the pH of the solution.

• 1. Universal indicator goes green if something is neutral.

• 1. Litmus indicator can only be used for acids.

• 1. Litmus indicator can only be used for alkalis.

Once propelled into the air, fireworks explode into brightly coloured stars. Salts of which element are used to create blue fireworks?

• 1. Copper

• 1. Lead

• 1. Cobalt

• 1. Iridium

I am an element you see every day. Rocks containing me can be described as "ferrous". The Earth's core is made up of mostly me. What element am I?

• 1. Iron

• 1. Zinc

• 1. Calcium

• 1. Uranium

Based on the equation given below, how is J related to I? K J × L + I P 

A+B means A is married to B A-B means A is sister of B A*B means A is brother of B A×B means A is father of B

• Mother

  
  

• Father

• Mother-in-law

• Father-in-law

In a certain code “CIRCUIT” is written as “DJSDVJU”. How “BOARD” is written in that code?

• CPBSE

  
  

• HRCFK

• NJELV

• ESAPT

Find the odd one out

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• 
• 
• 

Which layer of Earth’s atmosphere contains the ozone layer

• Troposphere

  
  

• Stratosphere

• Mesosphere

• Thermosphere