Technical Based Test Test 1 Nddc Scholarship
Question 41
Planets are kept in orbit by the?
Correct answer: D. Gravitational pull of the Sun
The Sun’s gravitational force provides the centripetal force that keeps planets in their orbits.
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Question 42
Which from the following is NOT a Renewable Energy?
Correct answer: C. Nuclear
Nuclear energy relies on finite uranium or thorium resources, making it non-renewable.
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Question 43
The current through a resistor in an A.C. circuit is given as 2 sin wt.
Determine the D.C. equivalent of the current.
Correct option: B. √2A
\[\textbf{Given:} \quad i(t) = 2 \sin \omega t\]
\[I_{\mathrm{rms}} = \dfrac{I_0}{\sqrt{2}}\]
\[I_0 = 2 \ \text{A}\]
\[I_{\mathrm{rms}} = \dfrac{2}{\sqrt{2}} = \sqrt{2} \ \text{A}\]
\[\boxed{\text{D.C. equivalent current} = \sqrt{2} \ \text{A}}\]
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Question 44
Short-sight defect could be corrected by a .
Correct answer: B. concave lens
A concave (diverging) lens corrects short-sightedness (myopia) by diverging incoming light rays so they focus on the retina.
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Question 45
For semi-conductors to have negative temperature coefficient of resistance implies that
Correct answer: D. their resistance decreases with temperature
In semiconductors, higher temperatures generate more charge carriers, reducing resistance.
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Question 46
The distance of Moon from the Earth is____________km.
Correct answer: B. 384,000
The average distance from the Earth to the Moon is about 384,000 km.
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Question 47
The primary coil of a transformer has N turns and is connected to a 120V A.C. power line. If the secondary coil has 1000 turns and a terminal voltage of 1200 volts, what is the value of N?
Correct option: C. 100
\[\textbf{Given:} \quad V_p = 120 \ \text{V}, \quad V_s = 1200 \ \text{V}, \quad N_s = 1000, \quad N_p = ?\]
\[\dfrac{V_s}{V_p} = \dfrac{N_s}{N_p}\]
\[\dfrac{1200}{120} = \dfrac{1000}{N_p}\]
\[10 = \dfrac{1000}{N_p}\]
\[N_p = \dfrac{1000}{10} = 100\]
\[\boxed{N_p = 100 \ \text{turns}}\]
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Question 48
Who was the founder of Electromagnetism
Correct answer D. Faraday
He made pioneering contributions to the study of electromagnetism and electromagnetic induction.
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Question 49
In measuring high frequency A.C. the instrument used is the
Correct option: A. Hot wire ammeter
Suitable for measuring high-frequency AC because its operation depends on heating effect, which is independent of frequency.
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Question 50
Organic chemistry is the study of
Answer B. Carbon containing compounds
Organic chemistry focuses on the study of compounds primarily made of carbon, often bonded with hydrogen, oxygen, nitrogen, and other elements.