Question Discussion & Solution

The correct answer is number of pixels.

• The resolution of the monitor is measured by a number of pixels on the monitor.
  • Resolution is the capability of a sensor to observe the smallest object clearly.
• Pixel is the smallest unit of an image/display that a computer is capable of printing or displaying.
  • It is the basic logical unit in digital graphics.
  • A complete image or any visible thing on a computer display is formed by a combination of pixels.
  • The resolution depends upon the size of the pixel.
  • Images with smaller pixels will have a higher resolution.

• Power: The rate of work done by the electric energy is called power. It is denoted by P.
  • The SI unit of power is the watt (W).
  • Watt is a small unit that's why kilowatt-hour is used as the unit for electrical energy.
• 1 unit of electric energy: When one-kilowatt load works for 1 hour then the energy consumed is called 1 unit of electricity.

1 Unit of electricity = 1 kWh = 1000 Watt-hour = 3.6 × 106 J

1 Kilo-watt = 1000 Watt

• 1 Watt: The energy consumption rate of 1 joule per second is called 1 watt.

EXPLANATION:

Since 1 hr = 3600 sec

1 kWh = 1000 W-hr = 1000 × 3600 watt sec = 3.6 × 10⁶ J 

​So option 1 is correct.

The correct answer is Mangifera indica.

Key Points

• Mangifera indica is the botanical name of mango.
  • In this name, Mangifera represents the genus while indica is a particular species.
• Scientific name
  • This system was given by Carolus Linnaeus.
  • Each name has two components – the Generic name and the specific epithet.
  • This system of providing a name with two components is called Binomial nomenclature.

Additional Information

• Monoon longifolium is an Asian small tree species in the family Annonaceae. Common names include false Ashoka, the Buddha tree, the Indian mast tree, and the Indian fir tree.
• Cocos nucifera is a Coconut tree. It is a tall tree that is native to tropical islands in the western Pacific. 
• Casuarina is a nitrogen-fixing tree through symbiotic relationship with an actinomycete called Frankia. Common names include coast sheoak, beach casuarina, beach oak, beach sheoak, beach pine, whistling tree, etc.

• 9.8 m/s² is the value of acceleration due to the gravity of the surface of the Earth.
• The acceleration which is gained by an object because of the gravitational force is called acceleration due to gravity.
• Its SI unit is m/s²

The correct answer is Sodium carbonate.

Key Points

• A toothpaste is defined as a semi-solid material for removing naturally occurring deposits from teeth and is supposed to be used simultaneously with a toothbrush.
• Toothpaste generally contains the following components:
  • Water (20–40%)
  • Abrasives (50%) including aluminum hydroxide, calcium hydrogen phosphates, calcium carbonate, magnesium carbonate, silica, and hydroxyapatite.
  • Fluoride (usually 1450 ppm) mainly in the form of sodium fluoride.