English (Part – B) (NDA SOLVED PAPER 2020 – II) (101 to 150)

Total Questions: 50

21. In an incandescent electric bulb, the filament of the bulb is made up of which metal?

Correct Answer: (c) Tungsten
Solution:

In an incandescent electric bulb, the filament of the bulb is made up of tungsten because it has very high melting point (3400°C).

22. Two equal resistors R are connected in parallel, and a battery of 12 V is connected across this combination. A dc current of 100 mA flows through the circuit as shown below:

Correct Answer: (b) 240 Ω
Solution:

23. Which one of the following is not the unit of energy?

Correct Answer: (d) kg-metre/sec²
Solution:

Amongst the given options,
kg-metre/sec² is not the unit of energy.
kg-(metre)/sec² is the unit of energy.
All other options are the units of energy.

24. Which one of the following statements is not correct?

Correct Answer: (d) Heating capacity of biogas is very low
Solution:

The heating capacity or calorific value of biogas is high due to which it is used for lighting.

25. In prokaryotic organisms, nuclear region is not surrounded by a membrane. This undefined nuclear region is known as

Correct Answer: (b) Nucleoid
Solution:

Prokaryotic organisms such as bacteria lack true nucleus, as their nuclear region is not bound by outer nuclear membrane. It is known as Nucleoid.
It has a circular DNA without histone proteins, which is the main genetic material of bacteria.

26. Which one of the following plant tissues has dead cells?

Correct Answer: (d) Sclerenchyma
Solution:

Sclerenchyma is a dead permanent tissue. Its cells These have heavily thickened secondary walls containing lignin. The cells are rigid, non-stretchable and lack protoplasma.
They provide protection and mechanical support to plant. They are usually found in non-growing regions of plant bodies such as the bark protective layering of seeds and fruits or mature stems.
Rest epithelium, paranchyma and collenchyma have living tissues.

27. Cartilage is not found in

Correct Answer: (d) urinary bladder
Solution:

Cartilage is not found urinary bladder. Urinary bladder consists of epithelium on the lumen surrounded by a collagen rich connective tissue and muscle layer.
Hyaline Cartilage is the type of cartilage found in areas such as nose, ears and larynx of the human body.

28. Two planets orbit the Sun in circular orbits, with their radius of orbit as R₁ = R orbit as R₂ = 4 R. Ratio of their periods (T₁/T₂) around the Sun will be

Correct Answer: (b) 1/8
Solution:

29. A metallic wire having resistance of 20 Ω is cut into two equal parts in length. These parts are then connected in parallel. The resistance of this parallel combination is equal to

Correct Answer: (c) 5 Ω
Solution:

30. Light of uniform intensity impinges perpendicularly on a totally reflecting surface. If the area of the surface is halved, the radiation force on it will become

Correct Answer: (b) half
Solution:

As, Radiation force ∝ Area of surface so, if area of the surface is halved, radiation force will also get halved.