A 35 year old woman has TSH level 6.03 mU/L. What change should she bring in her diet to control this level?
The mentioned 35-year-old woman is suffering from overproduction of TSH or higher TSH level. This increased TSH level can be... View Article
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What happens when water from great heights is made to fall on blades of turbine?
When water from great heights is made to fall on the blades of a turbine, the blades move and convert... View Article
Mention two disadvantages of constructing Tehri Dam.
The two disadvantages of constructing the Tehri Dam are loss of biodiversity in the catchment area and large-scale displacement of... View Article
Define 1 MW.
1 MW or a megawatt is a unit for measuring power equivalent to one million watts. 1 MW (1 Megawatt)... View Article
How is hydropower harnessed?
Hydropower is generated by collecting the water in a reservoir behind the dam and releasing the stored water to turn... View Article
The atomic radii of first group elements are given below : [Group-I element – Atomic Radii (pm)] Na – 86, K – 231, Rb – 244, Cs – 282 State the reason behind the observed trend in the above elements.
I) Group 1 elements Li Na K Rb Cs Atomic radius (pm) 152, 186, 231, 244, 262 ii) The elements... View Article
Define electropositivity
Electro positivity can be defined as the tendency of an atom to donate electrons and form positively charged cations. Electropositivity... View Article
How are covalent bonds formed?
Covalent bonds are formed by the sharing of electrons between two atoms so that both can achieve a completely filled... View Article
List two ways of increasing the strength of an electromagnet if the material of the electromagnet is fixed.
Two ways of increasing the strength of an electromagnet if the material of the electromagnet is fixed are as follows:... View Article
State the purpose of soft iron core used in making an electromagnet.
The purpose of soft iron core used in making an electromagnet is its property of losing all its magnetism when... View Article
Draw a labelled diagram to show how an electromagnet is made.
It works on the magnetic effect of current. It consists of a long coil of insulated copper wire wrapped around... View Article
What is an electromagnet? List any two uses.
Electromagnets are made out of a coil of wire (wire curled in series). This is more effective in producing a... View Article
An object 4.0 cm in size, is placed 25.0 cm in front of a concave mirror of focal length 15.0 cm. (i) At what distance from the mirror should a screen be placed in order to obtain a sharp image? (ii) Find the size of the image. (iii) Draw a ray diagram to show the formation of image in this case.
Height of the object, h1 = 4 cm Distance of the object from the mirror u = −25 cm Focal length of the mirror, f = −15 cm... View Article
Draw a ray diagram in each of the following cases to show the formation of image, when the object is placed: (i) between optical centre and principal focus of a convex lens. (ii) anywhere in front of a concave lens. (iii) at 2F of a convex lens. State the signs and values of magnifications in the above mentioned cases (i) and (ii).
Ray diagrams to show the formation of image, when the object is placed: (i) Between optical centre and principal focus of... View Article
Why are the traits acquired during the lifetime of an individual not inherited? Explain.
Acquired characters are the traits acquired by an organism during his lifetime, based on lifestyle. These traits are not passed... View Article
What is the law of dominance of traits? Explain with an example.
Mendel’s law of dominance In heterozygotes, one trait will suppress the expression of another trait for the same characteristics. An... View Article
Describe in brief how urine is produced in human body.
The mechanism of urine formation involves the following steps: Glomerular Filteration Glomerular filtration occurs in the glomerulus where blood is... View Article
Name the organs that form the excretory system in human beings
The organs that form the excretory system in human beings are kidney, renal arteries, renal veins, ureter, urinary bladder, and... View Article
Draw a diagram of human respiratory system and label – pharynx, trachea, lungs, diaphragm and alveolar sac on it.
The human respiratory system is a system of organs responsible for inhaling oxygen and exhaling carbon dioxide in humans. The... View Article
Why is there a difference in the rate of breathing between aquatic organisms and terrestrial organisms? Explain.
The rate of breathing in aquatic organisms is much faster than in terrestrial organisms because aquatic animals breathe from the... View Article
