Important Paper BCECE

1. A gas is found to have a formula [CO]x. Its vapour density is 70, the x is
(a) 3.0                                  
(b) 3.5
(c) 5.0                                   
(d) 6.5
Ans (C)
2.  Which of the following is used as purgative?
(a) HgS                                 
(b) Hg2Cl2
(c) HgCl2                              
(d) ZnSO4
Ans (B)
3.  Least stable oxide of chlorine is
(a) Cl2O                                
(b) ClO2
(c) Cl2O7                              
(d) ClO3
Ans (A)
4. The sides of safety matches contains
(a) red phosphorus + sand powder
(b) P4S3
(c) Ca3(PO)4 + glass pieces
(d) KCIO3, KNO3, sulphur + antimony
Ans (A)
5.  Chemically aspirin is known as
(a) salicylic acid                 
(b) salicylaldehyde
(c) 2-acetoxybenzoic acid
(d) phenyl salicylate
 Ans (C)
6. If forces of magnitude 12 kg-wt, S kg-wt and 13 kg-wt act at a point are in equilibrium, then the angle between the first two forces is
 (a) 30°                                 
(b) 90°
(c) 60°                                  
(d) 45°
Ans (B)
7. On one bank of river there is a tree. On another bank, an observer makes an angle of elevation of 60° at the top of the tree. The angle of elevation of the top of the tree at a distance 20 m away from the bank is 30°. The width of the river is
(a) 20 m                               
(b) 10 m
(c) 5 m                                 
(d) 1 m
Ans (B)
8. Let a, b, c be positive and not all equal, the a b c value of the determinant
(a) +ve                                 
(b) –ve
(c) zero                                                
(d) none of these
Ans (B)
9. A body is projected at such angle that the horizontal range is three times the greatest height. The angle of projection is
(a) 42°8'                                   
(b) 53°7'
(c) 33°7'                                   
(d) 25°8'
Ans (B)
10. A particle moving with a uniform acceleration travels 24 m and 64 m in the first two consecutive interval of 4 s each. Its initial velocity will be
(a) 5 m/s                                 
(b) 3 m/s
(c) 1 m/s                                 
(d) 4 m/s
 Ans (C)
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