General Engineering Test 1 Nddc Scholarship

Correct Answer: D. Gravitational pull of the Sun

Planets are kept in orbit around the Sun by the gravitational force that the Sun exerts on them. This force provides the necessary centripetal force that keeps each planet moving in a nearly circular path around the Sun rather than flying off in a straight line.

Correct Answer: C. Nuclear

Nuclear energy is not considered a renewable energy source because it relies on finite resources like uranium, which can be depleted. Renewable energy sources, such as geothermal, solar, and biofuels, are naturally replenished on a human timescale.

Given: The current through a resistor in an A.C. circuit is given by  \[I(t) = 2 \sin(\omega t)\]

The D.C. equivalent of an alternating current is its root mean square (rms) value, given by  \[I_{\text{rms}} = \dfrac{I_0}{\sqrt{2}}\]

The peak current \( I_0 = 2 \), so  \[I_{\text{rms}} = \dfrac{2}{\sqrt{2}} = \sqrt{2} \, \text{A}\]

\[\boxed{\text{Answer: B. } \sqrt{2} \text{ A}}\]  

Correct Answer:

B. concave lens

Short-sight (myopia) is a defect where distant objects appear blurry because their images form in front of the retina. It is corrected using a concave lens, which diverges light rays before they enter the eye so the image focuses correctly on the retina.

The correct answer is D. their resistance decreases with temperature.

In semiconductors, increasing temperature excites more electrons into the conduction band, increasing charge carriers. This leads to higher conductivity and thus a decrease in resistance, which is why they exhibit a negative temperature coefficient of resistance.

The correct answer is B. 384,000 km.

This is the average distance from the Moon to the Earth. The actual distance varies slightly due to the Moon’s elliptical orbit, ranging from about 363,300 km (perigee) to 405,500 km (apogee).

Given: The primary coil of a transformer has \( N \) turns and is connected to a 120 V A.C. power line.  
The secondary coil has 1000 turns and a terminal voltage of 1200 V.

The transformer equation is  \[\dfrac{V_s}{V_p} = \dfrac{N_s}{N_p}\]

Given values:  \[V_p = 120\,\text{V}, \quad V_s = 1200\,\text{V}, \quad N_s = 1000, \quad N_p = N\]

Substitute into the equation:  \[\dfrac{1200}{120} = \dfrac{1000}{N}\]

\[10 = \dfrac{1000}{N}\]

\[N = \dfrac{1000}{10} = 100\]

\[\boxed{\text{Answer: C. } 100}\]  

The correct answer is D. Faraday

Michael Faraday is credited as the founder of electromagnetism due to his groundbreaking work on electromagnetic induction, electric fields, and how electricity and magnetism are related.

The correct answer is A. hot wire ammeter

Hot wire ammeters are suitable for measuring high frequency A.C. because they respond to the heating effect of the current, which is independent of frequency, unlike other ammeters that are affected by electromagnetic behavior at high frequencies.

Answer: B. Carbon containing compounds

Organic chemistry is the branch of chemistry that deals with the structure, properties, and reactions of compounds that contain carbon. While many organic compounds also contain hydrogen, oxygen, and other elements, the defining element in organic chemistry is carbon.