CBSE ADDA

A. MULTIPLE-CHOICE QUESTIONS: Choose the most appropriate answer. 1. Humus and the smallest particles of rock form the a. A-horizon. b. B-horizon. c. C-horizon. d. bedrock 2. Which of these has the smallest size of particles?  a. sand b. silt c. clay d. gravel 3. Which type of soil is best for growing cotton?  a. sandy b. clayey c. loamy d. sandy-loam 4. Which of these does not cause weathering'? a. clouds b. wind c. flowing water d. freezing of rainwater 5. Water percolating into the soil collects over a. A-horizon. b. B-horizon. c. C-horizon. d. none of these 6. Water logging can be expected in soil which is rich in a. sand. b„ clay. c. silt. d. humus. 7. Paddy grows best in a. clayey soil. b. loam. c. sandy soil. d. sandy-loam. Answer. 1. a 2. c 3. d 4. a 5. d 6. b 7. a B. VERY SHORT-ANSWER QUESTIONS: Give one-word answers. 1. Breaking down of rock into smaller pieces by natural forces is called ----. 2. Which absorbs more water—sandy soil or cl

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Living science Heat and its effect questions with answer Ratna Sagar Publication For CPS Samastipur A. MUCUPLE-CHICE QUESTIONS: Choose the most appropriate answer. 1. Heat causes  a. change of state. b. change of temperature. c. expansion. d. all of these Ö 2. Heat causes expansion because  . heat occupies space.        b. of increase in the movement of molecules Ö c. matter tries to escape from the heat. .  d. none of the above is true—it is not yet known why heat causes expansion. 3. Which of these will expand the most on heating?         a. gold              b. water            C. mercury        d. air Ö 4. 0 0 C is the same temperature as  a. 0 °F b. 212 "F. c. 32 °F Ö  d. 100 °F. 5. A bimetallic strip is made of metals M1 and M2. On cooling through the same temperature, M 1 contracts more than M 2  When the strip is heated, it will a. bend towards M 1 .      b. bend towards M 2 . Ö     c. not bend at all.          d. direction of bending