Chapter 13: Sound
Sound Class 8 Science NCERT Textbook Questions Question 1.Choose the correct answer.Sound can travel through(a) gases only(b) solids only(c) liquids only(d) solids, liquids, and gasesAnswer:(d) solids, liquids, and gases. Question 2.Voice of which of the following is…
Chapter 12: Friction
Friction Class 8 Science NCERT Textbook Questions Question 1.Fill in the blanks.(a) Friction opposes the ______ between the surfaces in contact with each other.(b) Friction depends on the ______ of surfaces.(c) Friction produces ______(d) The sprinkling of…
Chapter 11: Force and Pressure
Force and Pressure Class 8 Science NCERT Textbook Questions Question 1.Give two examples each of the situations in which you push or pull to change the state of motion of objects.Answer:(i) Push: We close drawer by pushing.We…
Chapter 10: Reaching The Age of Adolescence
Reaching the Age of Adolescence Class 8 Science NCERT Textbook Questions Question 1.What is the term used for secretions of endocrine glands responsible for changes taking place in the body?Answer:Hormones Question 2.Define adolescence.Answer:The period of life, when…
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…
