General Science - Online Test
Q1. The tetrahedral molecule below where there are two lone pairs of electrons is
Answer : Option B
Explaination / Solution:
An important feature of water is its polar nature. The structure has a bent molecular geometry for the two hydrogens from the oxygen vertex. The oxygen atom also has two lone pairs of electrons.
Q2. A wheel with 10 metallic spokes each 0.5 m long is rotated with a speed of 60 rev/min in a plane normal to the horizontal component of earth’s magnetic field HE at a place. If HE = 0.4 G at the place, what is the induced emf between the axle and the rim of the wheel? Note that 1 G = 10–4 T.
Answer : Option D
Explaination / Solution:
e=12Bωl2=12×0.4×10−4×2×3.14×1×0.5×0.5=3.14×10−5V
ω=2πn
n=60/60=1rev/sec
Q3. A photon behaves as if it had a mass equal to
Answer : Option A
Explaination / Solution:
No Explaination.
Q4. A gas produced by paddy fields and involved in global warming is
Answer : Option D
Explaination / Solution:
Anaerobic decomposition of plants in water produces methane gas in paddy field. This gas is involved in global warming as methane is a green house gas beside carbon dioxide.
Q5. Hydrocarbons having double the number of carbon atoms than present in the original alkyl halide are produced by using
Answer : Option B
Explaination / Solution:
The Wurtz reaction, named after Charles-AdolpheWurtz, is a coupling reaction in organic chemistry, organometallic chemistry and recently inorganic main group polymers, whereby two alkyl halides arereacted with sodium metal in dry ethereal solution to form a higher alkane:
Q6. A computer system that combines text, graphics, voice and video is known as
Answer : Option C
Explaination / Solution:
No Explaination.
Q7. Alkali metal chlorides donot form hydrates except for one metal. Choose from among the options given below.
Answer : Option B
Explaination / Solution:
Lithium due to its high hydration energy(deliquescent) forms hydrate.
Q8. Fourier series of a repeating sine wave has a
Answer : Option C
Explaination / Solution:
No Explaination.
Q9. During hearing of a court case, the judge suspected that some changes in the documents had been carried out. He asked the forensic department to check the ink used at two different places. According to you which technique can give the best results?
Answer : Option A
Explaination / Solution:
TLC will give the best results.
Q10. The savings function derived from the consumption function c=-a+by is
Answer : Option A
Explaination / Solution:
No Explaination.
