1. The discriminant of the quadratic equation ax^2-4ax-2a+1=0 is

2. Two vertices of a triangle are (-2,-3) and (4,-1) and centroid is at the origin. The coordinates of the third vertex of the triangle are

3. If tan θ= 12/5 then 13 sin θ/3=

4. A hollow cylindrical pipe is 21 cm long. If its outer and inner diameters are 10 cm and 6 cm respectively , then the volume of the metal used in making the pipe is (Take Π=22/7)

5. The pair of linear equations

k x +4y =5

3x + 2y = 5 is consistent only when

6. Two lenses of power +2.50D and -3.75 D are combined to form a compound lens. Its focal length in cm will be

7. The speed of light in air is 3 × 10^8 ms^-1 whereas that of the speed of light in water is                    2.26 ×10^8 ms^-1 . What is the refractive index of water with respect to air ?

8. A charge of 100 C flows through a bulb in 5 minutes. How much current is flowing through the bulb?

9. The resistivity does not charge if

10. (A) Value of the frequency of AC supply in India          - (i) Green (yellow)

(B) Colour of the earth wire in household wiring          - (ii) 50

(C) Colour of the wire in which the 'switch' needs to

be put in a domestic electric circuits.                           - (iii) 15

(D) Rating of the fuse wire (in A) used in

domestic power circuits                                               - (iv) Red / Brown

11. Anaerobic process

12. Which one of the following statements is correct about the human circulatory system?

13. Most of the digestion and absorption of the food takes place in the

14. Which of the following plays the important role of creating a suction force which pulls water upwards from the roots of a tree to its leaves ?

15. If salivary amylase is lacking in the saliva, which of the following events in the mouth cavity will be affected ?

16. Which among the following statement(s) is (are) true? Exposure of silver chloride to sunlight for  long duration turns grey due to

(i) the formation of silver by decomposition of silver chloride

(ii) sublimation of silver chloride

(iii) decomposition of chloride gas from silver chloride

(iv) oxidation of silver chloride

17. Calcium oxide reacts vigorously with water to produce slaked lime.

Cao(s) + H2O (l) →Ca(OH)2(aq)

This reaction can be classified as :

(A) Combination reaction                               (B) Exothermic reaction

(C) Endothermic reaction                               (D) Oxidation reaction

Which of the following is a correct option?

18. Which of the following gives the correct increasing order of acidic strength ?

<

19. Na+ has

20. Which of the following compound contains double bond?

21. When world war I started ?

22. Which country were the main cause to world war I

23. Which country is first in population

24. Which country won 5 world cups in FIFA world cup

25. How many states are in India