List of top Questions asked in CBSE Class VIII

Explain why sportsmen use shoes with spikes.
Suppose your writing desk is tilted a little. A book kept on it starts sliding down. Show the direction of frictional force acting on it.
Alida runs her toy car on dry marble floor, wet marble floor, newspaper and towel spread on the floor. The force of friction acting on the car on different surfaces in increasing order will be
Divide as directed. 
  1.  \(5(2x + 1) (3x + 5) ÷ (2x + 1) \)
  2.  \(26xy(x + 5)(y – 4) ÷ 13x(y – 4) \)
  3.  \(52pqr (p + q) (q + r) (r + p) ÷ 104pq(q + r) (r + p) \)
  4.  \(20(y + 4) (y^ 2 + 5y + 3) ÷ 5(y + 4) \)
  5.  \(x(x + 1) (x + 2) (x + 3) ÷ x(x + 1)\)
Work out the following divisions. 
  1. \((10x – 25) ÷ 5\) 
  2.  \((10x – 25) ÷ (2x – 5) \)
  3.  \(10y(6y + 21) ÷ 5(2y + 7) \)
  4.  \(9x^ 2 y^ 2 (3z – 24) ÷ 27xy(z – 8) \)
  5. \( 96abc(3a – 12) (5b – 30) ÷ 144(a – 4) (b – 6)\)
Divide the given polynomial by the given monomial. 
  1. \((5x^ 2 – 6x) ÷ 3x \)
  2. \( (3y^ 8 – 4y^ 6 + 5y ^4 ) ÷ y ^4 \)
  3.  \(8(x^ 3y^ 2 z^ 2 + x^ 2y ^3 z^ 2 + x^ 2y ^2 z ^3 ) ÷ 4x ^2y ^2 z ^2 \)
  4.  \((x^ 3 + 2x^ 2 +3x) ÷ 2x \)
  5.  \((p^ 3q^ 6 – p^ 6q ^3 ) ÷ p^ 3q ^3\)
How do you think her geography teacher felt when he heard about what Tilly had done in Phuket?
Where did the Smith family and the others on the beach go to escape from the tsunami?
Where had Tilly seen the sea behaving in the same strange fashion?
What were the warning signs that both Tilly and her mother saw?
Fill in the blanks.
  1. Friction opposes the ___ between the surfaces in contact with each other.
  2. Friction depends on the ___ of surfaces.
  3. Friction produces ___.
  4. Sprinkling of powder on the carrom board ___ friction.
  5. Sliding friction is ___ than the static friction.
When we press the bulb of a dropper with its nozzle kept in water, air in the dropper is seen to escape in the form of bubbles. Once we release the pressure on the bulb, water gets filled in the dropper. The rise of water in the dropper is due to
A child staying in a coastal region tests the drinking water and also the seawater with his tester. He finds that the compass needle deflects more in the case of seawater. Can you explain the reason?
In case of a fire, before the firemen use the water hoses, they shut off the main electrical supply for the area. Explain why they do this.
What are sex hormones? Why are they named so? State their function.
Does pure water conduct electricity? If not, what can we do to make it conducting?
A tester is used to check the conduction of electricity through two liquids, labelled A and B. It is found that the bulb of the tester glows brightly for liquid A while it glows very dimly for liquid B. You would conclude that
Is it safe for the electrician to carry out electrical repairs outdoors during heavy downpour? Explain.
Prepare a Table having two columns depicting names of endocrine glands and hormones secreted by them.
Paheli had heard that rainwater is as good as distilled water. So she collected some rainwater in a clean glass tumbler and tested it using a tester. To her surprise she found that the compass needle showed deflection. What could be the reasons?
Name three liquids, which when tested in the manner shown in Fig.11.9, may cause the magnetic needle to deflect.
Fig.11.9
List changes in the body that take place at puberty.
Explain the process of formation of petroleum.
Explain why fossil fuels are exhaustible natural resources.
Suppose you are outside your home and an earthquake strikes. What precaution would you take to protect yourself?