Standard XIII

Q. The mole fraction of a solute in a 1 m aqueous solution is:

1. 0.0177
2. 0.177
3. 0.0344
4. 1.77

Q.

What is the role of the acid in our stomach?

Q.

Find the zeroes of the polynomial $x^2+\frac{1}{6}x-2$ and verify the relation between the coefficient and zeroes of the polynomial.

Q.

The distance between an octahedral and tetrahedral void in an fcc lattice is?

1. $\mathrm{a}\surd 3$

2. $\frac{\mathrm{a}\surd 3}{2}$

3. $\frac{\mathrm{a}\surd 3}{4}$

4. $\frac{\mathrm{a}\surd 3}{6}$

Q.

Define hybridization.

Q.

What are the raw materials for photosynthesis?

Q.

What are the 4 steps of translation?

Q.

What is inert pair effect? Explain with an example.

Q. The number of terms common to the two arithmetic progressions
$3,7,11,\dots ,407$ and $2,9,16,\dots ,709$ is

Q.

What is De Broglie Hypothesis?

Q. How many ATP molecules are produced during aerobic respiration of one molecule of glucose?

1. 24
2. 3
3. 38
4. 2

Q.

Find the zeros of the following quadratic polynomials $x^2-2x-8$ and verify the relationship between the zeros and the coefficients.

Q. What is the dimensions of $\frac{A}{B}$ in the relation $F=A\sqrt{x}+B{t}^2$, where $F$ is the force, $x$ is the distance and $t$ is the time?

1. $\left[M{L}^{-1/2}{T}^2\right]$
2. $\left[L^{-1/2}{T}^2\right]$
3. $\left[M^2{L}^{-1/2}{T}^2\right]$
4. $\left[L^{-1/2}T\right]$

Q.

Which of the following plant parts consist of two generations-one within the other?

1. Embryo sac inside the ovule

2. Pollen grains inside the anther

3. Germinated pollen grain with two male gametes

4. Both (A) and (B)

Q.

The dimensional formula for thermal conductivity is (here $\mathrm{K}$ denotes the temperature):

1. $ML{T}^{-3}{K}^{-1}$

2. $ML{T}^{-2}{K}^{-2}$

3. $ML{T}^{-2}K$

4. $ML{T}^{-3}K$

Q. What is the molarity of a 4.9% $H_{3}P{O}_4$ solution by mass? (Density of $H_{3}P{O}_4$ solution = 1.22 g/mL)?

1. 0.61 M
2. 0.05 M
3. 1.22 M
4. 1.54 M

Q.

How many muscles are found in the human body?

Q.

What are four differences between prokaryotic and eukaryotic cells?

Q.

Balance the equation: ${\mathrm{CaCO}}_3+\mathrm{HCl}\to {\mathrm{CaCl}}_2+{\mathrm{H}}_2\mathrm{O}+{\mathrm{CO}}_2$

Q.

Write the difference between Eukaryotes and Prokaryotes?

Q. Net gain of ATP molecules during glycolysis is

1. 24
2. 38
3. 4
4. 2

Q.

Which are the two major components of the biotic environment?

Q. The volume of gases evolved when dil. $H_{2}S{O}_4$ is electrolysed when 2F of charge is passed at STP is:

1. 33.6 L
2. 44.8 L
3. 22.4 L
4. 11.2 L

Q.

What do you mean by polar protic and polar aprotic solvents? What are some examples of these?

Q. The compound which shows metamerism is:

1. $C_3{H}_{8}O$
2. $C_3{H}_{6}O$
3. $C_5{H}_{12}$
4. $C_4{H}_{10}O$

Q.

Write the relation between coefficient of volume expansion and coefficient of linear expansion.

Q.

Can a child have a different blood type than their parents?

Q.

What is the angular momentum of an electron in d orbital?

Q. The value of ${81}^{\left(1/{\log }_{5}3\right)}+{27}^{{\log }_{9}36}+3^{\left(4/{\log }_{7}9\right)}$ is

Q.

A car travels along a straight line for first half time with speed $40km/hr$ and the second half time with speed $60km/hr$. Find the average speed of car.