JMI 11th Science Entrance Paper 2022 Answer Key

61. A spherical mirror and a spherical lens each have a focal length of -10 cm. The mirror and the lens are likely to be:

Ans (a) both concave

62. A magnified real image is formed by a convex lens when the object is at:

Ans (d) both (a) and (b)

63. A soft iron bar is introduced inside the current-carrying solenoid. The magnetic field inside the solenoid:

Ans (c) will increase

64. Which of the following terms does not represent electrical power in a circuit?

Ans (b) IR ^ 2

65. An electric bulb is rated 220V and 100W when it is operated on 110V, the power consumed will be:

Ans (c) 50 W

66. A cylindrical conductor of length ‘l’ and uniform cross-section A has resistance R. Another conductor of length ’21’ and resistance R of the same material has an area of cross-section:

Ans (c) 2A

67. The effective resistance between A and B is:

Ans (a) 4 ohm

68. A wire of resistance 202 is bent in the form of a close circle. What is the effective resistance between two points A and B, at the ends of any diameter of the circle?

Ans (c) 5 ohm

69. The device used for producing electric current is called a:

Ans (a) generator

70. A positively charged particle projected towards the west is deflected towards the north by a magnetic field. The direction of the magnetic field is:

Ans (d) upward

71. Which one of the following four metals would be displaced from the solution of its salts by the other three metals?

Ans (b) Ag

72. Reaction between X and Y, forms compound Z. X loses an electron and Y gains an electron. Which of the following properties is not shown by Z?

Ans (b) Has a low melting point

73. The displacement reaction between iron (III) oxide and a metal X is used for welding the rail tracks. Here X is:

Ans (d) Aluminium dust

74. Consider the following reaction: Identity x and y:

Ans (c) Ag and (s)

75. In the decomposition of solid FeSO,, the gas evolved is:

Ans (b) SO_{2} + SO