S Chand Biology Class 10 Solutions Model Test Paper 4 Question 1. Name a reducing agent that may be used to obtain manganese from manganese dioxide. Answer. Aluminium powder is used as the reducing agent to obtain manganese from its oxide. 2Al(s) + 3MgO → Al2O3 + 3Mg(s)Question 2. Why does a ray of light bend when it travels from one medium into … [Read more...]

S Chand Biology Class 10 Solutions Model Test Paper 3 Question 1. Why is the red color selected for danger signal lights? Answer: The wavelength of red light is the longest in visible light, so the red color is scattered the least by air molecules of the atmosphere and therefore it can reach to a longer distance. That's why the red color is used for danger signal … [Read more...]

S Chand Biology Class 10 Solutions Model Test Paper 2 Question 1. How is the increase in demand for energy affecting our environment adversely? Answer: As the population increases, so does their demand for energy. More and more of fossil fuels are being used to generate electricity and for transportation purposes. Use of fossil fuels in large amounts, add heat and pollution … [Read more...]

S Chand Biology Class 10 Solutions Model Test Paper 1 Question 1. From amongst the metals sodium, calcium, aluminium, copper and magnesium, name the metal. (a) which reacts with water only on boiling, and (b) another which does not react even with steam. Answer: When metals reacts with water(Hot, cold or steam), they displace hydrogen from the water and Hydrogen gas is … [Read more...]

S Chand Biology Class 10 Solutions Multiple Choice Questions (MCQs) Question 1. In the sketch of the stomatal apparatus given alongside, which one of the following is missing?(1) Cell membranes of the cells (2) Cell walls of the cells (3) Nuclei in the guard cells (4) Chloroplasts in the guard cells Answer: The nuclei in the guard cells is missing from the sketch of … [Read more...]