BHARATESH CENTRAL SCHOOL
SCIENCE
Time: 10:30 | Subject: SCIENCE | CLASS NAME: X Std |
1) an electric motor converts mechanical energy into electric energy. this statement is-- |
a) true | b) false | c) can't say | d) none of the above |
2) an electric motor converts mechanical energy into electric energy. this statement is-- |
a) true | b) false | c) can't say | d) none of the above |
3) -------- reproduction allows variations in offspring |
a) asexual | b) sexual | c) vegetative | d) all |
4) -------- reproduction allows variations in offspring |
a) asexual | b) sexual | c) vegetative | d) all |
5) ----- grows in t a root |
a) radical | b) plumule | c) seed coat | d) all |
6) ----- grows in t a root |
a) radical | b) plumule | c) seed coat | d) all |
7) a convex lens forms a real and highly magnified image. for this the object should be placed at |
a) center of curvature | b) 2F1 | c) 2F2 | d) F |
8) a convex lens forms a real and highly magnified image. for this the object should be placed at |
a) center of curvature | b) 2F1 | c) 2F2 | d) F |
9) in solar furnace ---------- mirror is used |
a) plane | b) convex | c) concave | d) all of the above |
10) in solar furnace ---------- mirror is used |
a) plane | b) convex | c) concave | d) all of the above |
11) if magnification is with positive sign then image is |
a) real | b) virtual | c) Can be real ir virtual | d) can not say |
12) if magnification is with positive sign then image is |
a) real | b) virtual | c) Can be real ir virtual | d) can not say |
13) the stars twinkle because of |
a) reflection of light | b) dispersion of light | c) refraction of light | d) all of the above |
14) the stars twinkle because of |
a) reflection of light | b) dispersion of light | c) refraction of light | d) all of the above |
15) What happens when silver chloride is put under sunlight? |
a) Silver metal and chlorine gas are formed | b) Silver metal and hydrogen gas are formed | c) Only silver metal is formed | d) Only hydrogen gas is formed |
16) What happens when silver chloride is put under sunlight? |
a) Silver metal and chlorine gas are formed | b) Silver metal and hydrogen gas are formed | c) Only silver metal is formed | d) Only hydrogen gas is formed |
17) Magnesium ribbon is rubbed before burning because it has a coating of |
a) basic magnesium oxide | b) basic magnesium carbonate | c) basic magnesium sulphide | d) basic magnesium chloride |
18) Magnesium ribbon is rubbed before burning because it has a coating of |
a) basic magnesium oxide | b) basic magnesium carbonate | c) basic magnesium sulphide | d) basic magnesium chloride |
19) Which of the following is termed as endothermic reaction? |
a) Reaction in which heat is evolved | b) Reaction in which heat is absorbed | c) Reaction in which there is loss of oxygen | d) Reaction in which there is gain of hydrogen |
20) Which of the following is termed as endothermic reaction? |
a) Reaction in which heat is evolved | b) Reaction in which heat is absorbed | c) Reaction in which there is loss of oxygen | d) Reaction in which there is gain of hydrogen |