Question Discussion & Solution

If '+' means 'divide by', '-' means 'add to', '×' means 'subtract from' and '/' means 'multiply by',

{(16 × 6) - (2 / 3)} + (3 - 1)] / 2

Now put the right symbol we get-

= [{(16 - 6) + (2 × 3)} / (3 + 1)] × 2

Now we apply BODMAS rule-

= [{10 + 6} / 4] × 2

= [16 / 4] × 2

= 4 × 2

= 8

Hence, "8" is the correct answer.

The correct answer is Bundi.

Key Points

• Shri Kamleshwar Mahadev Temple -
  • This temple is situated in Indragarh, Bundi.
  • This temple is situated on the bank of Chakan river.
  • The temple is said to have been built between the seventh and ninth centuries.
  • According to popular belief the Pandavas during the period, they spent incognito, built this temple.
  • This temple was built in Nagar style by Jaitra Singh.
  • Acharya Matsyendranath statue was found around this temple.

Important Points

• The main festival is that of Mahashivratri, but other festivals are equally important. Amongst them are Kartik Poornima, Basant Panchami, Guru Poornima and the Navratras.

Additional Information

• Some important temples of following districts-
  • Kota - Vibhisan temple, Gapernath temple, Mathuradheesh temple.
  • Jaipur - Govind Dev temple, Birla temple, Galta Ji, Jagat Shiromani temple.
  • Sirohi - Achaleshwar Mahadev temple, Sarneshwar Mahadev temple, Vashistha temple.

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.

A matter is something that occupies space, has shape, mass and volume. It can be categorized in the following categories:

• Solid: Solids are those, whose molecules are bounded tightly, hence the distance between them is the least.
  • The molecules are fixed in a position.
  • It has definite shape as well as mass.
  • It has a high density.
  • In this, vibration is the least because of tightly bound molecules
• Liquid: In this particles are more loosely packed as compared to solids. It can flow.
• Gas: In this, the molecules have a great space between them. It has no definite shape and volume.
• Plasma: It is an ionized gas substance that has sufficient energy to provide free electrons from molecules.

The correct answer is Archimedes' principle.

Concept:

Archimedes principle:

the principle of Archimedes states “When a body is immersed in a liquid, an upward thrust, equal to the weight of the liquid displaced, acts on it.”

Thus, when a solid is fully immersed in a liquid, it loses weight which is equal to the weight of the liquid it displaces.

i.e., \(Apperent\;weight = actual\;weight - buoyant\;force = mg - \rho gV\)

where m is mass of the object, ρ is the density of the fluid

Hence if there is no gravity, there is no Upward Thrust.

The upward force applied to the object is called the buoyant force.

Here,

ρ = density of liquid

g = acceleration due to gravity

V = volume of liquid displaced by the object

Explanation:

Archimedes’ principle, a physical law of buoyancy states that any body completely or partially submerged in a fluid (gas or liquid) at rest is acted upon by an upward, or buoyant, force the magnitude of which is equal to the weight of the fluid displaced by the body.

Hence floating of the ship is based on Archimedes principle: