Part – B General knowledge (English) (NDA/NA SOLVED PAPER 2019 (I) (51 to 100)

Total Questions: 50

1. Which one of the following cell organelles does not possess nucleic acid?

Correct Answer: (d) Plasma membrane
Solution:

The cell organelle given in option (d), i.e. plasma membrane does not contain nucleic acids. It is made up of lipids and proteins. Chloroplast contains deoxyribonucleic acid whereas ribosomes are made up of ribonucleic acids and proteins.
Nucleolus is made up of proteins and ribonncleic acids (RNA) and the site for the synthesis of ribosoural RNA.

2. Which one of the following cell organelles does not possess its own genetic material encoding proteins?

Correct Answer: (a) Ribosome
Solution:

Ribosome is the cell organelles, which does not possess its own genetic material (DNA) encoding proteins. Nucleus, mitochondria and chloroplast contain DNA which code for proteins needed by these cell organelles.

3. Which one of the following is not a component of conducting tissue in plants?

Correct Answer: (c) Pericycle
Solution:

Pericycle is not the component of conducting tissue. It is a part of the innermost layer of cortex.
Xylem and phloem both contain fibres. Tracheids are the part of xylem whereas sieve tubes are found in phloem.

4. Which one of the following organisms has vascular tissues?

Correct Answer: (c) Marsilea
Solution:

Marsilea is pteridophytic plant, which has primitive vascular tissues. Cladophora is an algae, Penicillium is a fungi. Anabaena is Blue-Green Algae (BGA).

5. Which one of the following organisms represents the primary consumer category in an ecosystem?

Correct Answer: (a) Caterpillar
Solution:

Caterpillar is primary consumer in an ecosystem. It is because it feeds on leaves and is a herbivore. Crabapple trese is a producer. Frog is a secondary consumer. Sparrowhawk is a top consumer.

6. Spring tides refer to:

Correct Answer: (a) greatest difference in the sea level at high and low tides
Solution:

The periodic rise & fall of sea level, once or twice a day, is called a Tide. When the Sun, the Moon and the Earth are in a straight line, the height of tides will be higher than normal. These are called spring tides, which occur on new Moon or full Moon day. At these times, high tides are very high & low tides are very low. Thus, spring tides refer to the greatest difference in the sea level at high and low tides.

7. Which one of the following energy is stored in the links between the atoms?

Correct Answer: (b) Chemical energy
Solution:Chemical energy is stored in the bonds of atoms and molecules.
Nuclear energy is stored in the nucleus of an atom.
Potential energy is the energy of position or gravitational potential energy.
Thermal energy or heat is the vibration or movement of atoms and molecules in substances.

8. The light energy escaping from the sun can be spread by:

Correct Answer: (a) a shower of rain drops
Solution:

The light energy escaping from the sun can be spread by a shower of rain drops. The sunlight shines on a water droplet.
As the light passes into the droplet, the light bends or refracts, a little because light travels slower in water than in air (because water is denser). Then, the light bounces off the back of water droplet and goes back the way it came, bending again as its speeds up when it exist the water droplet.
Hence, the light energy escaping from the sun can be spread. A disperse the light into VIBGYOR and spread it.

9. The correct sequence of energy transfer that occurs when an apple falls to the ground is:

Correct Answer: (c) gravitational potential energy → kinetic energy→ heat energy to air→ heat energy to ground and apple → sound energy
Solution:

When apple is on highest position, then it has only gravitational potential energy. When, it falls to the ground the first its gravitational potential energy starts converting into kinetic energy. Due to air friction some kinetic energy losses and converts into heat energy to air. When apple falls on the ground, then its remaining energy converts into heat energy to ground and sound energy. Hence, option (c) is correct.

10. Which one of the following mineral is used as a fuel in nuclear power stations?

Correct Answer: (d) Pitchblende
Solution:

Uraninite, formerly known as pitchblende is a radioactive uranium rich mineral which is used as a fuel in nuclear power stations. It is an ore with a chemical composition that is largely UO₂, but due to oxidation the mineral typically contains variable proportions of U₃O₈.