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Explain how a square is a parallelogram.

A square has its opposite sides equal and parallel, so, it is a parallelogram.... View Article

Write the complete symbol for the atom with the given atomic number (Z) and atomic mass (A). a. Z=17,A=35, b. Z=92,A=233, c. Z=4,A=9

(i) The atom with mass number 35 and atomic number 17 is Chlorine: 35Cl17 (ii) The atom with mass number 233 and atomic number 92 is... View Article

The percentage of carbon in CO2 is: (A) 0.034% (B) 27.27% (C) 3.4% (D) 28.7%

Answer: (B) 27.27% Mass percentage = (Mass of carbon)/(Molecular mass of compound) x 100 = 12/44 x 100 = 27.27%... View Article

In which year the first ozone hole was discovered? A. 1980 B. 1985 C. 1989 D. 1990

Answer: B. 1985... View Article

The distance between an octahedral and tetrahedral void in fcc lattice would be: A. a√3 B. a/√3 C. a√3/2 D. a√3/4

Answer: D. a√3/4 The distance between an octahedral and tetrahedral void in fcc lattice would be a√3/4.... View Article

What do you mean by electrical resonance? An LC circuit is in a condition of resonance.

The condition when the capacitve reactance becomes equal to inductive reactance is known as electrical resonance. In this condition of... View Article

The function of centrosome is: a. Inhibition of cell division b. Initiates cell division c. To increase protein synthesis d. None of the above

b. Initiates cell division... View Article

Denitrification is carried out by which bacteria? A. Pseudomonas B. Nitrobacter C. Nitrosomonas D. Nitrococcus

A. Pseudomonas... View Article

The styx number for B2H6 is: A. 2002 B. 2012 C. 2201 D. 2102

Answer: A. 2002 s = number of three-center, B-H-B, bridge bonds = 2 t = number of three-center B-B-B bonds = 0 y = number of two-center B-B... View Article

The site of cellular respiration in animal cell is: A) ribosome B) mitochondria C) endoplasmic reticulum D) lysosome

Answer: B) mitochondria The site of cellular respiration in animal cell is mitochondria.... View Article

A particle is thrown vertically upwards. Its velocity at half of the height is 10m/s, then the maximum height attained by it will be: (g = 10 m/s^2).A) 10mB) 20mC) 15mD) 25m

Answer: A) 10m Let the maximum height be h meter. By the equation of motion formulas, we know; v2 = u2 - 2gs where v is final velocity, g is... View Article

The sum of squares of first ten natural numbers is:

By the formula of sum of firts n natural numbers, we know, Sn = (1/6) n(n+1)(2n+1) Here n = 10 S10 = (1/6) 10 (10 + 1) (2.10+1) = 1/6 (10 x... View Article

Reaction which produces a yellow precipitate is: (A) NaOHaq+HClaq→NaCls+H2O (B) NaOHaq+BaClaq→BaOHs+NaClaq (C) Pb(NO3)2aq+2KIaq→2KNO3aq+PbI2s (D) CuOs+Mgs→Cus+MgOs (E) 4Fe+3O2→2Fe2O3

Answer: (C) Pb(NO3)2 (aq)+2KI(aq) → 2KNO3(aq) + PbI2(s)... View Article

In a plane perpendicular to the magnetic meridian, the dip needle will remain: (A) Vertical (B) Horizontal (C) At 45° from horizontal (D) At 60° from vertical

Answer: (A) Vertical In a plane perpendicular to the magnetic meridian, the dip needle will remain vertical.... View Article

A bivalent of Meiosis I consists of A. Four chromatids and two centromeres B. Two chromatids and one centromere C. Two chromatids and two centromere D. Four chromatids and four centromere

Answer: A. Four chromatids and two centromeres... View Article

If sinx + siny + sinz = 3. Find the value of cosx + cosy+ cosz.

Given, sinx+siny+sinz=3 as we know, sin 90° = 1 So, sin x = sin y = sinz = 1 (that makes 1 + 1 + 1 = 3) or x = y = z =... View Article

Which type of food is known as body-building food?

Proteins are body-building foods. The protein foods include dairy products, lean meat, seafood, poultry, eggs, soy products, beans and peas,... View Article

Define 1 kgf. How is it related to the S.I unit of force?

1 kgf is the force with which earth pulls an object of mass 1 kg towards itself. The S.I unit of force is N. Thus, 1 kgf = 9.8 N.... View Article

The major problem in harnessing nuclear energy is how to (a) split nuclei (b) sustain the reaction (c) dispose of spent fuel safely (d) convert nuclear energy into electrical energy

Answer: (c) dispose of spent fuel safely The major problem in harnessing nuclear energy is how to dispose of spent fuel safely. Nuclear plants... View Article

In which type of rock coal is found?

Coal is found in sedimentary rock as it is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams.... View Article