Question 1

For light travelling from diamond to air critical angle of incidence is 22^o. The refractive index of a diamond is ____. (given, sin 22^o = 0.375)
A) 0.375
B) 2.18
C) 1.47
D) 2.67

Question 2

Twinkling of stars, apparent sunrise and sunset can be explained by the phenomenon of ____.
A) atmospheric reflection
B) atmospheric refraction
C) atmospheric dispersion
D) total internal reflection

Question 3

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

Question 4

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 cm²
B) 20 cm²
C) 100 cm²
D) 200 cm²

Question 5

The state of PbO in the following reaction is ____.

2PbO 

A) solid
B) liquid
C) semi-solid
D) gas

Question 6

The pH values of solutions A, B, C and D are respectively 4.5, 2.5, 3.5 and 5.5 . The most acidic solution among them is ____.
A) A
B) B
C) C
D) D

Question 7

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

Question 8

Haemoglobin combines with oxygen to form oxyhaemoglobin.
A) True
B) False

Question 9

Which of the following helps in diverting the blood supply to muscles?
A) Thyroxine
B) Adrenaline
C) Insulin
D) Glucagon

Question 10

Which of the following will be the genotype of  upon crossing AaBb and aabb?
A) AaBb
B) Aabb
C) AaBb and aabb
D) AaBb, Aabb, aaBb, aabb