Chapter 9: Reproduction in Animals
Reproduction in Animals Class 8 Science NCERT Textbook Questions Question 1.Explain the importance of reproduction in organisms.Answer:Reproduction is vital for organisms because it: Question 2.Describe the process of fertilisation in human beings.Answer:Here’s the fertilization process in humans…
Chapter 12: Atoms
12.1 Choose the correct alternative from the clues given at the end ofthe each statement:(a) The size of the atom in Thomson’s model is ………. the atomicsize in Rutherford’s model. (much greater than/no differentfrom/much less than.)(b) In…
Chapter 11: Dual Nature of Radiation and Matter
11.1 Find the(a) maximum frequency, and(b) minimum wavelength of X-rays produced by 30 kV electrons. 11.2 The work function of caesium metal is 2.14 eV. When light offrequency 6 ×1014Hz is incident on the metal surface, photoemissionof…
Chapter 8: Cell Structure and Functions
Cell Structure and Functions Class 8 Science NCERT Textbook Questions Question 1.Indicate whether the following statements are True (T) or False (F).(a) Unicellular organisms have a one-celled body.(b) Muscle cells are branched.(c) The basic living unit of…
Chapter 10: Wave Optics
10.1 Monochromatic light of wavelength 589 nm is incident from air on awater surface. What are the wavelength, frequency and speed of(a) reflected, and (b) refracted light? Refractive index of water is1.33. Answer: 10.2 What is the…
Chapter 9: Ray Optics and Optical Instruments
Question 1.A small candle, 2.5 cm in size is placed at 27 cm in front of a concave mirror of radius of curvature 36 cm. At what distance from the mirror should a screen be placed in…
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…
