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basic question and answer to score full marks

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First Year / 7th Grade
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science basic for 7th to 10th std

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Q1. State Newton's first law of Motion.
Ans: Step-1- definition
Newton's first law states that an object will remain at rest or in uniform motion in a straight
line unless acted upon by an external unbalanced force.
Step-2-example
A book lying on a table remains at rest until someone pushes it.
Therefore Answer is law of inertia

Q2. Balance the chemical equation:H2+O2=H2O
Ans: Step-1- We should count atoms from both the sides
left: H=2,0=2; Right: H=2,0-1
step-2-Balance oxygen by putting 2 before H2O
H2+02 = 2H2O
Step-3-Now balance hydrogen
2H2+02=2H20
Final answer: 2H2+02=2H20

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