BHARATESH CENTRAL SCHOOL

SCIENCE

Time: 10:30Subject: SCIENCECLASS NAME: X Std

1) an electric motor converts mechanical energy into electric energy. this statement is--
      a) trueb) falsec) can't sayd) none of the above

2) an electric motor converts mechanical energy into electric energy. this statement is--
      a) trueb) falsec) can't sayd) none of the above

3) -------- reproduction allows variations in offspring
      a) asexualb) sexualc) vegetatived) all

4) -------- reproduction allows variations in offspring
      a) asexualb) sexualc) vegetatived) all

5) ----- grows in t a root
      a) radicalb) plumulec) seed coatd) all

6) ----- grows in t a root
      a) radicalb) plumulec) seed coatd) all

7) a convex lens forms a real and highly magnified image. for this the object should be placed at
      a) center of curvatureb) 2F1c) 2F2d) F

8) a convex lens forms a real and highly magnified image. for this the object should be placed at
      a) center of curvatureb) 2F1c) 2F2d) F

9) in solar furnace ---------- mirror is used
      a) planeb) convexc) concaved) all of the above

10) in solar furnace ---------- mirror is used
      a) planeb) convexc) concaved) all of the above

11) if magnification is with positive sign then image is
      a) realb) virtualc) Can be real ir virtuald) can not say

12) if magnification is with positive sign then image is
      a) realb) virtualc) Can be real ir virtuald) can not say

13) the stars twinkle because of
      a) reflection of lightb) dispersion of lightc) refraction of lightd) all of the above

14) the stars twinkle because of
      a) reflection of lightb) dispersion of lightc) refraction of lightd) all of the above

15) What happens when silver chloride is put under sunlight?
      a) Silver metal and chlorine gas are formedb) Silver metal and hydrogen gas are formedc) Only silver metal is formedd) Only hydrogen gas is formed

16) What happens when silver chloride is put under sunlight?
      a) Silver metal and chlorine gas are formedb) Silver metal and hydrogen gas are formedc) Only silver metal is formedd) Only hydrogen gas is formed

17) Magnesium ribbon is rubbed before burning because it has a coating of
      a) basic magnesium oxideb) basic magnesium carbonatec) basic magnesium sulphided) basic magnesium chloride

18) Magnesium ribbon is rubbed before burning because it has a coating of
      a) basic magnesium oxideb) basic magnesium carbonatec) basic magnesium sulphided) basic magnesium chloride

19) Which of the following is termed as endothermic reaction?
      a) Reaction in which heat is evolvedb) Reaction in which heat is absorbedc) Reaction in which there is loss of oxygend) Reaction in which there is gain of hydrogen

20) Which of the following is termed as endothermic reaction?
      a) Reaction in which heat is evolvedb) Reaction in which heat is absorbedc) Reaction in which there is loss of oxygend) Reaction in which there is gain of hydrogen