Saleha Pervez, Mansi Garg and, Poonam Singh Solutions for Chapter: Practice Set, Exercise 1: ANALYSE YOURSELF

The phenomenon of ejection of electrons from the surface of metals when the light of suitable wavelength falls on it, is known as:

Consider the following statements:

$1$. Missile Development Programme is considered the brainchild of Dr. APJ Abdul Kalam.

$2$. The Integrated Guided Missile Development Programme (IGMDP) was formed in $1983$ to achieve self-sufficiency in missile development and production.

$3$. Under IGMDP, Prithvi, Akash, Prahaar, and Nag missiles were developed.

Which of the statements given above are correct?

Roasting is carried out to:

1. convert sulphide to oxide and sulphate.

2. remove water of hydration.

3. melt the ore.

4. remove arsenic and sulphur impurities.

Which of the statements given above are correct?

Consider the following statements:

A. Thermal radiation is electromagnetic waves.

B. Thermal radiations are reflected in the mirror.

C. All bodies emit thermal radiation at all temperatures.

D. Thermal radiations of all wavelengths travel in free space with the same velocity.

Which of the statements given above are correct?

Consider the following statements:

1. Agni Missile was originally termed as a re-entry technology demonstrator.

2. The Agni series of missiles are guided by Ring Laser Gyro based on Inertial Navigation System.

3. Agni V has a range of 8000-10000 km.

Which of the statements given above are correct?

Consider the following statements:

1. Acid rain is caused by the emission of carbon dioxide, sulphur dioxide and nitrogen oxide.

2. The most important gas which leads to acidification is sulphur dioxide.

Which of the statements given above is/are correct?

Identify the correct order of velocity (speed) of sound given:

VO₂ = velocity of sound in O₂ gas

VN₂ = Velocity of sound in N₂ gas

VH₂ = Velocity of sound in H₂

VCl₂ gas vat = Velocity of sound in Cl₂ gas

Consider the following statements about pollination:

$1$. Self-Pollination is the transfer of pollen grains from the anther to ovules in the same or a different flower.

$2$. The pollination by wind is called anemophily.

$3$. Pollination by birds is known as ornithophily.

$4$. Pollination is a prerequisite for seed and fruit development in all flowering plants.

$5$. Seeds may develop in some water ferns without pollination.

Which of the statements given above is correct?