Jharkhand PECE Sample Questions
A. Two consecutive odd positive numbers such as a sum of whose squares is 290.
- 11,13
 - 9,11
 - 13,15
 - 19,17
 
B. The value of K so that the following system of equations 3x - y + 5 = 0 and 6x - 2y + k = 0 has no solution. 
- K is not equal to 1
 - K is equal to 1
 - K equal to 10
 - K not equal to 10
 
C. which of the following cannot be the difference between a two-digit number and the number obtained after the interchange of digits? 
- 72
 - 36
 - 54
 - 48
 
D. 2 men and 7 boys can do a piece of work in 4 days. 4 men and 4 boys can do the same work in 3 days. Then the number of days a boy takes to complete the work will be  - 
- 55 days
 - 60 days
 - 0 days
 - 55 days
 
E. The process of formation of covalent bonds with other atoms to form long chains is called -
- Addition
 - Coordination
 - Catenation
 - Polymerization
 
F. Modern Period Law is based on - 
- Atomic mass
 - Mass number
 - Atomic number
 - Electronic configuration
 
G. The element is electropositive in nature - 
- Sulpher
 - Silicon
 - Boron
 - Copper
 
H. Reaction of marble into atmospheric humility and carbon dioxide to form slaked lime is an example of - 
- Decomposition Reaction
 - Combination Reaction
 - Displacement Reaction
 - Redox Reaction
 
I. Transparent Photographic Films gradually change their color when exposed to light due to  - 
- Combination Reaction
 - Thermal Decomposition
 - Oxidation Reaction
 - Displacement Reaction
 
J. The colour of Phenolphthalein in an acidic medium is-
- Pink
 - Yellow
 - Colourless
 - Orange
 
K. The element with a half-filled outermost electronic configuration - 
- Aluminum
 - Magnesium
 - Boron
 - Nitrogen 
 
L. When IJ of work is done in moving a charge of 1 coulomb from one point to another point B in an electric circuit, then it refers to the following - 
- 1-ampere current between points A and B.
 - 1V of potential difference between two points A and B
 - 1.6 * 10 to the power 19 columb of charge between two points A and B
 - None of the above
 
M. The electric fuse is based on -
- The chemical effect of the current
 - The magnetic effect of the current
 - The healing effect of the current
 - None of the above
 
N. To work properly, wind electric generators use wind speeds of at least about - 
- 1.5 km/h
 - 15 km/h
 - 150 km/h
 - 1500 km/h