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Draw a labelled diagram of a Graafian follicle.

Answer: A structure in the ovary of a female mammal consisting of an oocyte surrounded by granular follicle cells that also enclose a huge,... View Article

Good fuel is: (1) Readly available (2) Cheap (3) Burn easily in air (4) All of the above

Answer: (4) A fuel is considered good or desirable when it has a low ignition temperature and generates a significant amount of heat. It reflects... View Article

What is refraction of light? Draw the diagram of refraction of light in glass slab. Write the laws of refraction.

Answer: Refraction is the bending of a wave when it enters a medium where its speed is different. We can define it as the change in direction... View Article

Assertion (A) All enzymes are proteins but all proteins are not enzymes.Reason (R) Enzymes are biocatalysts and have stable configuration having an active site. (1) Both A and R are correct but R is the correct explanation for A (2) Both A and R are correct but R is not the correct explanation for A (3) A is correct but R is not correct (4) A is incorrect but R is correct.

Answer: (2) Enzymes can be defined as biological polymers that catalyze biochemical reactions. The majority of enzymes are proteins with... View Article

In which of the following medium speed of the sound is maximum? (1) Steel (2) Wood (3) Water (4) Air (5) Helium

Answer: (1) The speed of sound is the distance travelled per unit time by any sound. The speed of sound is defined as the dynamic propagation... View Article

Which of the following statements are true and which are false? In each case give a valid reason for saying so (i) p : Each radius of a circle is a chord of the circle (ii) q : The centre of a circle bisects each chord of the circle (iii) r : Circle is a particular case of an ellipse (iv) s : If x and y are integers such that x>y then −x<−y (v) t : suqare root of 11 is a rational number.

Answer: (i) Given: Each radius of a circle is a chord of the circle The radius meets the circle at only one point whereas a chord meets the... View Article

Explain Ostwald’s dilution law.

Answer: Ostwald's dilution law describes the dissociation constant of the weak electrolyte with the degree of dissociation (α) and the... View Article

Calculate velocity of electron in first Bohr orbit of hydrogen atom (Given,r=a)

Answer: To answer this question, we must first comprehend the Bohr model. Niels Bohr and Ernest Rutherford proposed this idea. According to... View Article

Given the value of Rydberg constant is 107m−1, the waves number of the lest line of the Balmer series in hydrogen spectrum will be: (1) 0.025×104m−1 (2) 0.5×107m−1 (3) 0.25×107m−1 (4) 2.5×107m−1

Answer: (3) We know that: λ1= R(1/n12−1/n22) For last line Balmer's series, n1=2 and n2=∞ λ1=... View Article

Explain the mechanism of muscle contraction with diagram

Answer: Sliding filament theory is the theory that has been accepted for explaining the contraction of muscles. According to this... View Article

Archaeopteryx is a connecting link between (1) Reptiles and birds (2) Fish and amphibian (3) Birds and mammals (4) Amphibians and bird

Answer: (1) Archaeopteryx is known to be a communicating connection between reptiles and birds because it looks like a bird and has bird wings.... View Article

Prove that √ 3 is an irrational number.

Answer: Irrational numbers are real numbers that cannot be represented as a simple fraction. It cannot be expressed in the form of a ratio, such... View Article

Describe the structure and function of cerebrum

Answer: The cerebrum is the largest part of the brain. It consists of the cerebral cortex and other subcortical structures. It is composed of... View Article

What is a ball and socket joint?

Answer: The ball and socket joint is a type of synovial joint in which one bone is hooked into the hollow space of another bone. This type of... View Article

Find the total surface area of cubes having the following sides.1) 3 cm2) 5 cm3) 5.5 cm

Answer: Total surface area of cubes (TSA) = 6a2 (1) a = 3cm TSA = 6 × 3 × 3 TSA = 54 sq.cm (2) a = 5 cm TSA = 6 × 5 × 5... View Article

Find the distance of the point (-2,3,-4) from the line (x+2) /3 = (2y+3) /4 = (3z+4) /5 measured parallel to the plane 4x+12y-3z+1=0.

Answer: Let us consider P = ( -2, 3, -4 ) Let π be the plane parallel to the given plane through P, and let Q be the point where the given line... View Article

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