Chapter 8: Electromagnetic Waves
8.1 Figure 8.6 shows a capacitor made of two circular plates each ofradius 12 cm, and separated by 5.0 cm. The capacitor is beingcharged by an external source (not shown in the figure). Thecharging current is constant…
Chapter 7: Conservation of Plants and Animals
Conservation of Plants and Animals Class 8 Science NCERT Textbook Questions Question 1.Fill in the blanks.(a) A place where animals are protected in their natural habitat is called ______(b) Species found only in a particular area is…
Chapter 7: Alternating Current
7.1 A 100 Ω resistor is connected to a 220 V, 50 Hz ac supply.(a) What is the rms value of current in the circuit?(b) What is the net power consumed over a full cycle? 7.2 (a)…
Chapter 6: Combustion and Flame
Combustion and Flame Class 8 Science NCERT Textbook Questions Question 1.List conditions under which combustion can take place.Answer:There are three main conditions necessary for combustion to occur: Question 2.Fill in the blanks.(a) Burning of wood and coal…
Chapter 6: Electromagnetic Induction
6.1 Predict the direction of induced current in the situations describedby the following Figs. 6.18(a) to (f ). even if the charges are stationary [and the q (v × B) term of the Lorentzforce is not operative],…
Chapter 5: Materials Coal and Petroleum
Coal and Petroleum Class 8 Science NCERT Textbook Questions Question 1.What are the advantages of using CNG and LPG as fuels?Answer: CNG and LPG offer several benefits: Question 2.Name the petroleum product used for surfacing of roads.Answer:Bitumen…
Chapter 5: Magnetism and Matter
5.1 Answer the following questions regarding earth’s magnetism:(a) A vector needs three quantities for its specification. Name thethree independent quantities conventionally used to specify theearth’s magnetic field.(b) The angle of dip at a location in southern India…
Chapter 4: Materials Metals and Non Metals
Materials: Metals and Non-Metals Class 8 Science NCERT Textbook Questions Question 1.Which of the following can be beaten into thin sheets?(a) Zinc(b) Phosphorus(c) Sulphur(d) OxygenAnswer:(a) Zinc Question 2.Which of the following statements is correct?(a) All metals are…
Chapter 4: Moving Charges and Magnetism
4.1 A circular coil of wire consisting of 100 turns, each of radius 8.0 cmcarries a current of 0.40 A. What is the magnitude of the magneticfield B at the centre of the coil? 4.2 A long…
Chapter 3: Synthetic Fibers and Plastics
Synthetic Fibres and Plastics Class 8 Science NCERT Textbook Questions Question 1.Explain why some fibres are called synthetic.Answer:Some fibres are called synthetic fibres because they are made by man using chemicals. Question 2.Mark (✓) the correct answer.Rayon…
