Show that any positive odd integer is of the form 6q + 1 or 6q + 3 or 6q + 5; where q is some integer.
What are integers? The integers is a special set of numbers comprising zero, positive numbers and negative numbers. Examples of... View Article
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Explain why the ceilings of concert halls are curved?
Concert halls are very big, so the sound might not reach every corner of the hall. So, ceilings of concert... View Article
Why do we need a prism for dispersion of light?
A light ray is refracted (bent) when it passes from one medium to another at an angle and its speed... View Article
Give an account of different names given to Indian subcontinent.
The Indian subcontinent throughout history had a number of names such as Bharat, Aryavarta, Riva, Hindustan and India. These names... View Article
A new unit of length is chosen such that the speed of light in a vacuum is unity. What is the distance between the sun and the earth in terms of the new unit if light takes 8 minutes and 20 seconds to cover this distance?
Answer: Speed of light in a vacuum is unity, Speed of light = 1 unit Time taken = t =... View Article
What is the role of chlorophyll in photosynthesis?
Chlorophyll is vital for photosynthesis, which allows plants to absorb energy from light. Light energy is converted into chemical energy.... View Article
Mention the names of any 8 common disease, their causative agents, symptoms and their preventive measures.
Disease Causative agent Symptom Prevention Chickenpox varicella-zoster virus; Esp saw winter & spring. Resp symptoms, malaise (not feeling well), low-grade... View Article
What is the meaning of polyhedral virus?
Polyhedral viruses consist of nucleic acid surrounded by a polyhedral (many-sided) shell or capsid, usually in the form of an... View Article
Which convex mirror is used as the driver’s mirror? What is its drawback?
The image size is smaller than the object size, the objects in the mirror appear to be farther than they... View Article
Raina and Dheeraj measured their body temperature by different thermometers. Raina found it to be 37-degree Celsius and Dheeraj recorded 98.6-degrees Fahrenheit. Why?
Thermometers show body temperature in either degree Fahrenheit (°F) or degrees Celsius (°C). In the United States, temperatures are often... View Article
Why does the solubility of a solute decrease with a decrease in temperature?
As the temperature increases, the solubility of a gas decrease as shown by the downward trend in the graph. More... View Article
What is parasite?
A parasite is an organism that lives on or in a host organism and gets its food from or at... View Article
Why is water essential from our body?
Why water is important to our body? Water is one of the most important factors in our life which helps... View Article
Silver is used to make good quality mirrors. Why?
Silver is a metal of moderate melting temperature, malleable, best heat and conductivity of any metal, and high reflectance. It... View Article
What are bad conductors?
Non-metals are generally bad conductors or insulators. Metals, on the other hand, are good conductors. The poor conductor has very... View Article
What is thermal expansion?
Thermal expansion is the tendency of matter to change in volume in response to temperature alterations. When a substance is... View Article
The sum of two numbers is 55 and the HCF and LCM of these two numbers are 5 and 20 respectively. Find the sum of reciprocals of these numbers.
Product of numebrs = 5 x 120 = 600 factors = 5 x 5 x 3 x 2 x 2... View Article
If (6,k) is a solution of the equation 3x+y-22 = 0, then the value of K is?
Given equation is 3x+y=22 Since (6,k) is a solution, put x=6 and y=k in the given equation ∴3(6)+k=22 ⇒k=22−18=4
What is the difference between thermal dissociation and electrolytic dissociation?
Thermal Dissociation Electrolytic dissociation The decomposition of a compound into its element by heat is called thermal dissociation. The process... View Article
Is duodenum C shaped or U shaped?
The duodenum is the first section of the small intestine in most higher vertebrates … The duodenum is a 25–30... View Article
