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  KOSMIK IIT SCHOOL TEST, CLASS 10 KOSMIK IIT KOSMIK IIT BOARD ENGINEERING MEDICAL FOR CLASS- 8 , 9 10, 11 12 - ATTEMPT ALL QUESTION. -EACH QUESTION CARRIES ONE MARK. -( √ ) TICK THE CORRECT ANSWER    NAME: ROLL NO -------------------------------------------------------------------- 1.   Polarity of an electromagnet gets reversed by  ____. A) decreasing the number of turns B) increasing the number of turns C) reversing the direction of current D) switching of current 2.   In an electric bell, we use a ____ because the magnetism developed in the rod is ____. A) soft iron rod, permanent B) steel rod, permanent C) soft iron rod, temporary D) steel rod, temporary 3.   A lens of power +3.5 D is placed in contact with a lens of power -2.5 D. The combination will  behave like a ____. A) concave lens of 100 cm focal length B) convex lens of 100 cm focal length C) concave lens of 10 cm focal length D) convex lens of 10 cm focal length 4.   The electric current through a conductor is always equal to the potential difference (PD) across its ends. A) True B) False 5.   3MnO 2  + 4Al → 3Mn + 2Al 2 O 3 + heat The substance that is getting oxidised in this reaction is ____. 6.   A) Al B) MnO 2  C) Mn D) Al 2 O 3  7.   IUPAC name of the compound CH 2 Cl-CH 2 -CH 2 -COOH is ____. A) 2-chloro butanoic acid B) 3-chloro butanoic acid C) 4-chloro butanoic acid D) 1-chloro butanoic acid 8.   Which of the following is the correct order of the respiratory organs in human beings? A) Nose, trachea, alveoli, bronchi and  bronchioles B) Nose, bronchioles, trachea, alveoli and  bronchi C) Nose, trachea, bronchi, bronchioles and alveoli D) Nose, nostrils, bronchi, alveoli and  bronchioles 9.   The balanced chemical equation for the following reaction with the physical states of reactants and products is ____. Potassium metal reacts with water to give  potassium hydroxide solution and hydrogen gas. A) 2K(s) + 2H 2 O(l) → 2KOH(aq) + H 2 (g) B) K(s) + H 2 O(g) → KOH(l) + H 2 (g) C) K(s) + 2H 2 O (aq) → 2KOH(s) + H 2 (g) D) 2K(s) + 2H 2 O(aq) → KOH(s) + 2H 2 (g) 10.   The cation in MgCl 2  is ____. A) Mg ++  B) Mg +  C) Cl D) Cl  -  11.   When a gene exists in more than one form, the different forms are called ____. A) Alleles B) Genotypes C) Heterozygotes D) Phenotypes 12.   If two identical prisms are placed parallel to each other in upside down position with each other, then the light dispersed by prism ABC is recombined by prism A'B'C'. The light coming out of the prism A'B'C' is of ____ colour. A) red B) white C) blue D) green 13.   When a potential difference of 250 V is applied across a resistor, 0.5 A current flows in it. Then the rate at which heat is produced by the resistor is ____ J/s. A) 500 B) 62.5  KOSMIK IIT SCHOOL TEST, CLASS 10 KOSMIK IIT C) 1520 D) 125 14.   reacts with dilute to form  ____ gas. A) B) C) CO D) 15.   Percentage of oxygen and carbon dioxide in the atmosphere are balanced by ____. A) photosynthesis B) respiration C) combustion D) photosynthesis and respiration 16.   An electric heater of resistance 50 is used by connecting it to 200 V mains, for 4 hours daily. The energy cost is Rs 2.50 per unit. The cost of electrical energy consumed by it in a month is  ____. A) Rs. 250 B) Rs. 230 C) Rs. 240 D) Rs. 290 17.   When a circular coil placed in a uniform magnetic field of induction 7.5 T, is removed from it in 0.02 s, emf induced in the coil is 7.5 volt. The area of the coil is ____. A) 2 cm 2  B) 20 cm 2  C) 100 cm 2  D) 200 cm 2  18.   Arrange Zn, Mg, Al, Cu, Fe in decreasing order of reactivity. A) Mg > Al > Zn > Fe > Cu B) Fe < Cu < Al < Mg < Zn C) Mg > Zn > Al > Fe > Cu D) Zn > Mg > Al > Cu > Fe 19.   Two plane mirrors are placed perpendicular to each other. A ray striking the first mirror at an angle of incidence of 45 o  after reflection falls on the second mirror. The direction of the ray after reflection from the second mirror will be ____ to the first incident ray. A) parallel B) perpendicular C) at an angle of 30 o  D) at an angle of 45 o  20.   The balanced equation for the following reaction is ____. A) B) C) D) 21.   Which of the following controls and integrates the activities of pituitary gland? A) Spinal cord B) Hypothalamus C) Pans varolli D) Medulla oblongata 22.   A straight current carrying conductor is placed in east-west direction. When the magnitude of current is doubled, the force acting on it ____. A) increases 4 times B) is halved C) remains same D) is doubled 23.   In plants, large amount of water is lost through  ____. A) stomata B) guard cells C) chloroplasts D) mesophyll cells 24.   A circular coil is aligned horizontally and certain amount of current flows though the coil in clockwise direction when viewed from above the coil. The direction of magnetic field at the centre of the coil due to the current is ____. A) vertically downward B) vertically upward C) towards east D) towards west 25.   An object is placed 20 cm in front of a convex mirror of radius of curvature 80 cm. The distance of the image formed by the mirror is  ____ cm from its pole.  KOSMIK IIT SCHOOL TEST, CLASS 10 KOSMIK IIT A) 10 B) 12.33 C) 13.33 D) 14.33 MATHEMATICS 26.   The roots of the equation are: A. 14 and 13 B. -14 and 13 C. 12 and 15 D. -12 and 15 27.   The n th  term of the AP 10, 7, 4, 1 …is: A. 3n + 1 B. 10 – n C. n + 1 D. 13 – 3n 28.   The number of tangents that can be drawn from an external point to a circle is: A. Three B. Two C. One D. Zero 29.   The radii of the top and bottom of a frustum of a cone are 4 cm and 3 cm, respectively, and the height is 5 cm. Then its slant height is: A. B. C. D. 30.   = A. 0 B. -1 C. 1 D. ∞  31.   In the figure given here, PA and PB are tangents to the circle drawn from an external point P. CD is a third tangent touching the circle at Q. If PB = 10 cm and CQ = 2 cm, then the length of PC is: A. 5 cm B. 10 cm C. 12 cm D. 8 cm 32.   The angle between any tangent and the radius at the point of contact of a circle is: A. 45 0  B. 90 0  C. 60 0  D. 30 0  33.   The radius and height of a cylinder are in the ratio 2 : 3, and its volume is 12936 cm 3 . The height of the cylinder is: A. 21 cm B. 14 cm C. 15 cm D. 24 cm 34.   An ant is at a point having its abscissa as 4 and ordinate as 5. It moves north for 5 units then west for 6 units. The final position of the ant and the distance between its initial position and final positions are ____. A) and units B) and units C) and units D) and units 35.   The number 32760 can be expressed in the form of product of prime exponents as _____. A) B) C) D) 36.   In the figure below, the curve represents a  polynomial.  KOSMIK IIT SCHOOL TEST, CLASS 10 KOSMIK IIT The number of zeroes of the polynomial is  ____ A) 2 B) 1 C) 3 D) 4 37.   The roots of the equation are ____. A) B) C) D) 38.   The following graph represents the less than ogive of the given frequency distribution. 39.   A) True B) False 40.   A and B each have certain number of oranges. A says to B, if you give me 10 of your oranges, I will have twice the number of oranges left with you . B replies, if you give me 10 of your oranges, I will have the same number of oranges as left with you . The number of oranges with A and B are ____. A) 40 and 80 B) 30 and 50 C) 70 and 30 D) 70 and 50

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Jul 23, 2017
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