Question Discussion & Solution

Clearly, out of every 11 persons there is 1 teacher

So, Number of teachers = 550 ÷ 11 = 50

The correct answer is Twelve.

• Twelve members are nominated by the President in Rajya Sabha.

Key Points

• Rajya Sabha [Article 80]:
  • Rajya Sabha is a permanent body and not subject to dissolution. Its maximum strength is 250. The total membership of the present Rajya Sabha is 245 however one-third members retire every second
    year.
  • Their seats are filled up by fresh elections and a presidential nomination at the beginning of every third year.
  • There are no seats reserved for SCs and STs in Rajya Sabha.
  • Representation of People Act (1951) provided the term of office of a member of the Rajya Sabha shall be six years. 
  • In the Rajya Sabha, 12 members are nominated by the President from persons having special knowledge or practical experience of literature, science, art and social service.
  • The President is empowered to nominate not more than two Anglo Indian members to the Lok Sabha if that community is not adequately represented in that House.

The correct answer is option 4) i.e. All of the above

CONCEPT:

• Magnetic field: The region around a magnet where its influence is experienced is called the magnetic field.
  • The visual representation of the magnetic field is called magnetic field lines.

​

• ​Properties of magnetic field lines:
  1. ​​The field lines start from the north pole and end at the south pole.
  2. The field lines are crowded where the magnetic field is the strongest.
  3. The field lines form continuous curves.
  4. The field lines do not intersect.

EXPLANATION:

• The magnetic field is strongest near the poles. Since magnetic field lines start and end at poles, they converge towards the region of strong magnetic force.
• Two magnetic field lines cannot intersect. If they did, at the point of intersection, the magnetic field will have two directions - which is not possible.
• The magnetic field lines have direction as they are represented as flowing, though no actual movement occurs. So, they do not move.

Therefore, all the given statements are true.

The correct answer is Virus protection.

Functions of operating system are:

• Therefore, Virus Protection is not the function of OS. It is a function of Firewall and Antivirus.

The correct answer is to Correct the eye defects.

• Lenses are widely used in spectacle to correct eye defects.
• There are three common defects of vision that can be corrected with the help of suitable spherical lenses (convex lenses or concave lenses).
• Myopia is also known as Short-sightedness or nearsightedness.
  • Due to this defect, the person cannot see the distant objects clearly but he/she can see the nearby objects clearly.
  • The far point of the eye having myopia is less than infinity.
  • The defect is caused due to the high converging power of eye-lens or due to the eyeball being too long.
  • It can be corrected by making use of spectacles containing concave lenses.
• Hypermetropia is also known as Long-sightedness or farsightedness.
  • Due to this defect, the person cannot see the nearby objects clearly but he/she can see the distant objects clearly.
  • The near point of a hypermetropic eye is more than 25 centimetres away.
  • The defect is caused due to the low converging power of eye-lens or due to the eye-ball being too short.
  • It can be corrected by making use of spectacles containing convex lenses.
• Presbyopia is a vision disease caused mostly in old age.
  • The ciliary muscles become weak and the eye-lens become rigid and the eye loses its power of accommodation in old age in this vision defect.
  • In Presbyopia the person cannot see the nearby objects clearly due to loss of power of accommodation of the eye.
  • The near point of the old person having presbyopia gradually reduces and becomes much more than 25 centimetres away.
  • It can be corrected by making use of spectacles containing convex lenses.
• A person suffering from both Myopia and Hypermetropia uses spectacles having bifocal lenses in which the upper part consists of a concave lens to correct myopia and the lower part consists of a convex lens to correct hypermetropia.