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Which part of the Earth is the coolest?

A Core
B Crust
C Mantle
D All of these

Three blocks A, B and C, of masses 4 kg, 2 kg and 1 kg respectively, are in contact on a frictionless surface, as shown in the figure. If a force of 14 N is applied on the 4 kg block, then the contact force between A and B is


A 8 N
B 4 N
C 2 N
D 6 N

Mass spectrum of an element Q having two isotopes Q₁ and Q₂ is shown in the given graph.

If Q₂ is 8.082 times heavier than ¹²C and Q₁ is 7.833 times heavier than ¹²C then, the molecular mass of compound, QO₁ will be approximately
(Given : Atomic mass of O = 16 u)

A 94 u
B 128 u
C 96 u
D 125 u.

Two point objects A and B having masses in the ratio 4 : 3 are separated by a distance of 1 m. When another point object C of mass M is placed in between A and B, the force between A and C is (1/3)^rd of the force between B and C. Then, the distance of C from A is

A
B
C
D

Gloria is holding her hand quite close to the side of a candle flame without feeling hot. This is because

AAir is a gas and is a poor conductor of heat.
BAir is highly inflammable
CCandle flame does not produce heat.
DNone of these

The given graph shows the effect of pH on the activity of four different enzymes (P, Q, R and S). Which of the following correctly identifies enzyme found in the stomach, small intestine and one not affected by pH?

There is a definite relationship between figures (i) and (ii). Establish the same relationship between figures (iii) and (iv) by selecting a figure from the options which will replace the (?) in figure (iv).



A
B
C
D

The name of which of the following CANNOT be obtained by using the letters given in the box? (You can use each letter more than once.)


A It is formed by condensation of atmospheric water vapour on cold exposed surfaces like leaves of plants.
B It is formed when atmospheric water vapour condenses and freezes on a surface which cools past dew point.
C It is a form of precipitation occurring in plains and leading to floods at times.
D It forms when thunderstorm updrafts are strong enough to carry water droplets above the freezing level causing them to freeze.