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Study the given flow chart carefully and fill in the blanks by choosing an appropriate option.

The refraction through the prisms are as shown. Choose the wrong statement from the following. Path of the light ray in


A (I) is correct if μ₂ > μ₁ and μ₂ > μ₃
B (II) is correct if μ₁ = μ₂ and μ₂ > μ₃
C (III) is correct if μ₂ > μ₁ and μ₂ = μ₃
D (IV) is correct if μ₁ > μ₂ and μ₂ < μ₃.

Genetic drift can be defined as

A A random change in gene frequencies of the remaining population, occurring by chance fluctuations
B A change in an allele due to alteration in the DNA molecule
C A change in gene frequencies due to exchange of genes between different populations
D A product of natural selection.

Study the given experimental set-up.

By measuring the movement of the oil drop in the apparatus, what can be investigated?

A Carbon dioxide is released during germination
B Heat is released during germination
C Oxygen is used during germination
D Water is produced during germination

How many pairs of letters are there in the word SUPPOSITION which have as many letters between them in the word as in the English alphabet?

A4
B6
C7
DMore than 7

Which of the elements having following positions, have same number of valence electrons as that of element with atomic number 6?
(i) Group 14 and period 5
(ii) Group 14 and period 4
(iii) Group 6 and period 4
(iv) Group 14 and period 3

A (i) and (ii) only
B (i), (ii) and (iii) only
C (i), (ii) and (iv) only
D All of these

A stream of electrons is projected horizontally to the left. A straight current carrying conductor is supported parallel to the electron stream and above it. If the current in the conductor is flowing from left to right then, what will be the effect on the electron stream ?

AThe stream of electrons will be pulled upwards.
BThe stream of electrons will be pushed downwards.
CThe stream of electrons will be retarded.
DThe stream of electrons will speed up towards the right.

Rahul, a class 10 student conducted two experiments as follows :
Experiment 1 : Excess calcium carbonate was added to 100 cm³ of 0.2 mol/dm³ HCl at 25°C.
Experiment 2 : Excess calcium carbonate was added to 80 cm³ of HCl of concentration X mol/dm³ and at temperature Y°C.
Following curves show results of the experiments.

Identify X and Y.

Two long current carrying wires are arranged in parallel as shown. What is the direction of the electromagnetic force on each wire?

Two different positions of a dice are shown. What is the number of dots at the top, if 5 dots are at the bottom?



A2
B4
C6
D3