Subtract 4a – 7ab + 3b + 12 from 12a – 9ab + 5b – 3
Answer: 8a – 2ab + 2b – 15 4a – 7ab + 3b + 12 from 12a – 9ab +... View Article
Latest Posts
Subtract 4p2q – 3pq + 5pq2 – 8p + 7q – 10 from 18 – 3p – 11q + 5pq – 2pq2 + 5p2q
Answer: 28 + 5p – 18q + 8pq – 7pq2 + p2q 4p2q – 3pq + 5pq2 – 8p +... View Article
Subtract: 3a (a + b + c ) – 2b (a – b + c) from 4c ( -a + b + c )
Answer: -7ac + 6bc + 4c2 – 3a2 – ab – 2b2 4c (- a + b + c )... View Article
Subtract: 3l (l – 4m + 5n) from 4l ( 10n – 3m + 2l )
Answer: 25ln + 5l2 3l(l – 4m + 5n) from 4l (10n – 3m + 2l) 4l (10n – 3m... View Article
Suggest three measures to limit noise pollution in your locality.
Answer: Noise is the unpleasant and undesirable sound which leads to discomfort in human beings. The intensity of sound is... View Article
Suggest two methods to find out wind direction at a given place.
Answer: The wind is an air movement having both direction and speed. It is made up of gusts and eddies... View Article
Sun appears to move from east to west around the earth. This means that earth rotates from (a) east to west (b) west to east (c) north to south (d) west to north
Answer: (b) west to east Sun appears to move from east to west around the earth which means the earth... View Article
Suppose a new planet is discovered between Uranus and Neptune. Its time period would be (a) less than that of Neptune. (b) more than that of Neptune. (c) equal to that of Neptune or Uranus. (d) less than that of Uranus.
Answer: (a) less than that of Neptune. We know that the time period is directly proportional to the distance from... View Article
Suppose a stick is struck against a frying pan in a vacuum. Will the frying pan vibrate? Will we be able to hear the sound? Explain.
Answer: The frying pan will vibrate. We will not be able to hear the sound of vibration because sound cannot... View Article
Suppose the distance between earth and sun becomes half of its present distance. What is likely to happen to life?
Answer: Life may no longer exist because some special environmental conditions are needed for the existence and continuation of life... View Article
Suppose the moon emits light of its own. Would it still have phases? Justify your answer
Answer: As the moon does not emit its own light and reflects the light of the sun. phases are seen.... View Article
Suppose you are outside your home and an earthquake strikes. What precaution would you take to protect yourself?
Answer: An earthquake is the shaking of the Earth’s surface caused by a sudden release of energy in the Earth’s... View Article
Tell what property allows you to compute 1/3 × (6 × 4/3) as (1/3 × 6) × 4/3
Answer: Given 1/3 × (6 × 4/3) = (1/3 × 6) × 4/3 In this case, the way factors are... View Article
The aluminium strips in an electroscope as shown in fig. are replaced by plastic strips and a charged body is brought in contact with the metal clip. What will happen?
Answer: We cannot predict whether the object is charged or not if aluminium strips are replaced with plastic strips, as... View Article
The angle between the incident ray and the reflected ray is 60°. What is the value of the angle of incidence?
Answer: The angle of reflection is equal to the angle of incidence. Since Angle of incident ray+ Angle of reflected... View Article
The average weather taken over a long time is called ___________.
Answer: The average weather taken over a long time is called climate. Cloudy, sunny, rainy, stormy, or clear weather all... View Article
The bulb does not glow in the setup shown in Fig.. List the possible reasons. Explain your answer.
Answer: It’s possible that the bulb isn’t glowing for the following reasons: It’s possible that the liquid isn’t conducting. The... View Article
The chemical symbol for nitrogen gas is (a) Ni (b) N2 (c) N+ (d) N
Answer: (b) N2 The chemical formula of Nitrogen is N but Nitrogen exist in the molecule of two ions hence... View Article
The decaying leaves and animal droppings in a forest enrich the ___
Answer: The decaying leaves and animal droppings in a forest enrich the soil. Forests help purify and increase the oxygen... View Article
The distance between the object and its image formed by a plane mirror appears to be 24 cm. What is the distance between the mirror and the object?
Answer: The image generated by a plane mirror is the same distance behind the mirror as the object in front... View Article
