Question Discussion & Solution

The correct answer is Tamil Nadu.

Key Points

•  Bharatnatyam:
  • ​Bharatnatyam Dance is considered to be over 2000 years old.
  • Several texts beginning with Bharata Muni's Natya Shastra (200 B.C.E to 200 C.E.) provide information on this dance form.
  • Bharatnatyam Dance is known to be Ekaharya, where one dancer takes on many roles in a single performance.

Additional Information

•  8 Classical Dances of India:

The correct answer is ​Myopia.

Key Points

• Nearsightedness (myopia) is a common vision condition in which you can see objects near to you clearly, but objects farther away are blurry.
• It occurs when the shape of your eye causes light rays to bend (refract) incorrectly, focusing images in front of your retina instead of on your retina.
• A Concave lens (diverging lens) is used by people suffering from myopia.

Additional Information 

• Far-sightedness, also known as long-sightedness, hypermetropia, or hyperopia, is a condition of the eye where distant objects are seen clearly but near objects appear blurred.
  • This blurred effect is due to incoming light being focused behind, instead of on, the retina wall due to insufficient accommodation by the lens.
• Night blindness is a type of vision impairment also known as nyctalopia.
  • People with night blindness experience poor vision at night or in dimly lit environments.
  • Although the term “night blindness” implies that you can't see at night, this isn't the case.
• Astigmatism: This defect arises due to the difference in the radius of curvature of the cornea in the different planes
  • The cylindrical lens is used by people suffering from Astigmatism.

• In SQL, the function - avg, min, max, sum, count is called as aggregate function.
• Aggregate functions return a single value after calculating from a group of values.
• avg() function returns the average values, max() returns the maximum value, count() finds the number of rows that matches the specified condition, min() returns the minimum value, Max() returns the maximum value. sum() returns the sum of values.

Example:

SELECT AVG(salary

FROM employees

GROUP BY department_id;

All are divisible by 10 except 25.

The correct answer is Element.

Key Points

• An electric room heater or an electric heater used for cooking contains a coil of wire.
• The coil of wire used in electric heaters is called a heating element.
• The heating coil of the electric room heater transfers the electric energy into heat energy.
• The elements become red hot and give out heat after connecting to the electric supply.
• The amount of heat produced in a wire depends on its material used, length, and thickness.
• The coil of the electric heater is made up of nichrome.
• Nichrome consists of 80% nickel, 20% chromium.

Additional Information

• The filament is usually made of very thin tungsten wire.
  • In an incandescent bulb, an electric current is passed through a metal filament.
• A cell is a single unit device that converts chemical energy into electric energy.
  • It produces electricity capable to run smaller appliances.
• A battery usually consists of a group of cells.

Mistake Points

• A filament is a fine resistance wire the purpose of which is to emit white light. 
• An element is a resistive wire the sole purpose of which is to produce heat.