Science All General Science Aptitude

D. Trypsin is an enzyme. Trypsin is a protease enzyme that plays a role in the digestion of proteins in the digestive system. Glucagon, insulin, and somatotropin (somatrophin) are hormones, not enzymes.

The third proportional to two numbers \(a\) and \(b\) is given by the expression \( \dfrac{b^2}{a} \). 

In this case, the third proportional to 9 and 12 is:

\[ \text{Third proportional} = \dfrac{12^2}{9} = \dfrac{144}{9} = 16 \]

So, the correct answer is:

B. 16

D. Skin is the organ of the body affected by Leukoderma. Leukoderma, also known as vitiligo, is a skin condition characterized by the loss of pigment, resulting in white patches on the skin. It is not associated with internal organs such as the heart, kidneys, or lungs.

When two bodies collide and stick together, the conservation of linear momentum can be used to find the final velocity of the combined mass. The formula for the conservation of linear momentum is:

\[ m_1u_1 + m_2u_2 = (m_1 + m_2)v_f \]

where:
- \( m_1 \) and \( m_2 \) are the masses,
- \( u_1 \) and \( u_2 \) are the initial velocities,
- \( v_f \) is the final velocity.

In this case, the first body has mass \( m \) and initial velocity \( 4 \, \text{km/h} \), and the second body has mass \( 3m \) and is at rest (\( u_2 = 0 \)). The coalesced mass has a final velocity \( v_f \).

\[ m \times 4 + 3m \times 0 = (m + 3m) \times v_f \]

\[ 4m = 4m \times v_f \]

\[ v_f = 1 \, \text{km/h} \]

Therefore, the coalesced mass starts to move with a velocity of \( \mathbf{1 \, \text{km/h}} \) (option C).

A. Tissues are groups of cells having a common origin and performing similar functions. Tissues are the next level of organization above cells, and they combine to form organs, which further combine to form organ systems.

The relationship between work done (\(W\)), charge (\(Q\)), and potential difference (\(V\)) is given by the equation:

\[ W = Q \cdot V \]

Given that the work done (\(W\)) is 20 J and the potential difference (\(V\)) is 10 V, we can rearrange the equation to solve for the charge (\(Q\)):

\[ Q = \dfrac{W}{V} \]

\[ Q = \dfrac{20 \, \text{J}}{10 \, \text{V}} \]

\[ Q = 2 \, \text{C} \]

Therefore, the charge is \( \mathbf{2.0 \, C} \) (option B).

Work done by external forces = Change in kinetic energy Since particle starts from rest, its initial Kinetic Energy is 0. Therefore, K.E.=Fd It is given that force is constant. We see that Kinetic energy is independent of mass

The tissue found beneath the skin, around the kidneys, and between the internal organs is D. Adipose tissue. Adipose tissue is a type of connective tissue that stores fat and provides insulation, cushioning, and energy storage in the body.

The purest form of carbon among the options provided is:

C. Diamond

Diamond is a pure form of carbon where each carbon atom is bonded to four other carbon atoms in a tetrahedral structure, resulting in a three-dimensional crystal lattice.

The correct statement for metals is:

A. Metals have 1 to 3 valence electrons in their outermost orbit.