Q:

A parallel-plate capacitor of capacitance C1is  made  using  two  gold  plates.  Another parallel-plate capacitor of capacitance C2is made  using  two  aluminium  plates  with same  plate  separation,  and  all  the  four plates  are  of  same  area.  If gand aPare respectively  the  electrical  resistivities  of gold and aluminium, then which one of the following relations is correct?

A) C1>C2 B) C2>C1
C) C1pa = C2pg D) C1 = C2
 
Answer & Explanation Answer: D) C1 = C2

Explanation:

C1= capacitance of gold plates

C2=   capacitance   of   aluminium plates

rg= Gold’s resistivity

ra= Aluminium’s resistivity

As the capacitance depends on the shape,  size  &  geometrical  placing of  the  conductors  &  the  medium between them, hence, the value of capacitance  will  be  independent  of resistivity. Therefore, C1= C2

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Filed Under: Physics
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0 2023
Q:

A copper wire of radius r and length lhas a resistance of R. A second copper wire with radius 2r and length lis taken and the two wires  are  joined  in  a  parallel  combination. The  resultant  resistance   of  the  parallel combination of the two wires will be

A) 5 R B) 5 R/4
C) 4 R/5 D) R/5
 
Answer & Explanation Answer: D) R/5

Explanation:

1st copper wire: R = pl/A = pl/ πr2

2ndcopper wire: R’ = p’l’/A’ = pl/(4 πr2) = R/4

If joined in parallel, (1/Req) = (1/R) + (1/R’)

= 1/R + 4/R1/Req= 5/R

Req= R/5

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2 2522
Q:

Consider the electromagnetic radiations having wavelengths 200 nm, 500 nm and 1000 nm. Which wavelength (s) of the following can make visual sensation to a human eye?

A) 200 nm and 500 nm B) 500 nm and 1000 nm
C) 500 nm only D) 200 nm and 1000 nm
 
Answer & Explanation Answer: C) 500 nm only

Explanation:
Visual image of human eye is 390-700 nanometer. So, approximate value is 500 nanometer only.
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3 2054
Q:

The plant growth regulators are small, simple molecules of diverse chemical composition. They are

A) carbohydrates, fats and proteins B) indole compounds, adenine derivatives, carotenoids and terpenes
C) fatty acids, glucose and vitamins D) vitamin C, vitamin D and glucose
 
Answer & Explanation Answer: B) indole compounds, adenine derivatives, carotenoids and terpenes

Explanation:

The  plant  growth  regulators  are small,  simple  molecules  of  diversechemical composition. They can be in   form   of   indole   compounds, adenine   derivatives,   carotenoids derivatives,terpenes  or  gases  like ethyleneetc.The   plant   growth regulators  are  bifurcated  into  two groups according to their functions in  a  living  plant  body.First  group of   plant   growth   regulators   are found   in   growth   activities,   for instance,  cell  division,  flowering, fruiting  and  seed  formation.The second   group   of   Plant   growth regulators   are   involved   in   plant responses  to  wounds  and  stresses of biotic and abiotic origin.

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Filed Under: Biology
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1 965
Q:

The mammalian heart is myogenic and it is regulated by nerves. The heartbeat originates from

A) sinoatrial node B) QRS wave
C) T wave D) hepatic portal system
 
Answer & Explanation Answer: C) T wave

Explanation:

The mammalian heartis called myogenic (myo = muscle, genie = originating from). It means the heart beat or the activities of the heart are auto regulated which originates from a muscle called nodal tissue.In the human heart,heartbeat originates and contraction is initiated by a special modified heart muscle known as sinoatrial node. It is located in the right atrium; while the QRS waves are the depolarisation of the ventricles, which initiates the ventricular contraction.The T-wave represents the repolarisation,that is, the return of the ventricles from excited tonormal state.Hepatic portal system is the unique vascular connection that exists between the digestive tract and liver. This vein carries blood from intestine to the liver.

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Filed Under: Biology
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3 1351
Q:

Kwashiorkor  disease  in  children  is  caused by

A) sufficient carbohydrates but less fats in diet B) sufficient  carbohydrates  and  fats  but deficient proteins in diet
C) sufficient  vitamins  but  deficient  fats  in diet D) sufficient  fats  but  deficient  vitamins  in diet
 
Answer & Explanation Answer: B) sufficient  carbohydrates  and  fats  but deficient proteins in diet

Explanation:

Kwashiorkar is produced by protein deficiency unaccompanied by calorie  deficiency.  It  results  from the  replacement  of  mother’s  milk by a high calorie-low protein diet in a child more than one year in age. Like marasmus, kwashiorkor shows wasting   of   muscles,   thinning   of limbs,  failure  of  growth  and  brain development

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2 980
Q:

Which one of the following statements with regard to volcanoes is not correct?

A) Stratovolcanoes produce lava flows that initially follow valleys but are highly resistant to erosion. B) The surrounding areas can remain highlands, lava ridges or mesas.
C) Hawaiian shield volcanoes are eroded by steams that form deeply carved valleys with steeply sloping heads. D) The system of streams on a dissected volcano cone is not a radial drainage pattern.
 
Answer & Explanation Answer: D) The system of streams on a dissected volcano cone is not a radial drainage pattern.

Explanation:

Stratovolcano,    also    known    as acomposite  volcano,  is  aconical volcanobuilt  up  by  many  layers (strata) of hardened lava, tephra, pumice and ash. Because it is stratified, therefore  it  will  definitely  form  a volcano cone.

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Filed Under: General Science
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0 1021
Q:

Which  one  of  the  following  is  the  correct sequence  of  occurrences  of  rivers  from Chennai to Kolkata when travelled by road (shortest distance)?

A) Krishna,  Kaveri,  Godavari,  Mahanadi, Subarnarekha B) Krishna,  Periyar,  Godavari,  Mahanadi, Subarnarekha
C) Penneru,Krishna, Godavari, Mahanadi, Subarnarekha D) Penneru,    Mahanadi,    Subarnarekha, Godavari, Krishna
 
Answer & Explanation Answer: C) Penneru,Krishna, Godavari, Mahanadi, Subarnarekha

Explanation:

From south to northeast. Penneru-Andhra Pradesh, Krishna-Karnataka, Godavari-Maharashtra, Mahanadi-Odisha,  Subarnarekha-Jharkhand.

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Filed Under: Indian Geography
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0 842