The mass number of a nucleus is (a) Always less than its atomic number (b) Always more than its atomic number (c) Sometimes more than and sometimes equal to its atomic number (d) None of the above2 22094
The maximum KE of the photoelectron emitted from a surface is dependent on (a) The intensity of incident radiation (b) The potential of the collector electrode (c) The frequency of incident radiation (d) The angle of incidence of radiation of the surface1 1902
Which of the following is not an essential condition for interference (a) The two interfering waves must be propagated in almost the same direction or the two interfering waves must intersect at a very small angle (b) The waves must have the same time period and wavelength (c) Amplitude of the two waves should be the same (d) The interfering beams of light must originate from the same source.1 3475
When X-Ray photons collide with electrons (a) They slow down (b) Their mass increases (c) Their wave length increases (d) Their energy decreases.1 4504
An electron emits energy (a) Because its in orbit (b) When it jumps from one energy level to another (c) Electrons are attracted towards the nucleus (d) The electrostatic force is insufficient to hold the electrons in orbits.1 1563
In a balanced chemical equation (a) Atoms are conserved (b) Molecules are conserved (c) Moles are conserved (d) Reactant and product molecules are preserved.1 17225
How many grams of NaOH will react with 0.2 equivalent of HCl? (a) 0.59 (b) 0.285 (c) 1.18 (d) none of these.2 3619
Which of the following is least acidic (a) Ortho-cresol (b) Para-cresol (c) Phenol (d) Meta-cresol.1 2356
In Reimer-Tiemann?s reaction, the reaction intermediate is (a) Carbene (b) Dichloro carbene (c) Carbonion (d) Carbonium ion.1 6515
Which of the following is most acidic? (a) C2H5OH (b) CH3CHOHCH3 (c) Ethanol (d) CH3OH.1 3461
A catalyst (a)always slows down the reaction (b)always starts a rection that would not have ocurred at all otherwise (c)causes changes in the rate of the reaction (d)changes the quantities of the products formed.1 1601
The rate of the first order reaction depends on the (a) Concentration of the reactant (b) Concentration of the product (c) Time (d) Temperature.1 1699
Integrate 3x + 5 / (x3-x2-x+1)?798
NLO : RPS : : ? : ZXA
What two possibilities are there to describe how gene fragments may have evolved?
What are the current challenges in the Pharmaceutical and biotechnology sectors?
How can we find the direction of an nucleotide substitution, for example; C to T or T to C?
What is C-compliator?
Bootstrap analysis evaluates evolutionary trees by sampling columns from the original alignment with replacement (multiplying or removing some of them) and computing a proportion of times that a particular branch appears in the resulting trees. What is the main idea behind this approach?
How do ESTs work?
How to Insert Genomic DNA into yeast ?
What is the difference in terms of connectivity between a scale free network and random network?
What is the idea behind ?weighting? sequences in the package CLUSTAL W for multiple alignment? How are these weights calculated?
Can DeCypher be used for protein struc-ture modeling?
How to run DOCK 6 using cygwin?
What is the secondary structure of intron ?
what is the image of point (3,8) in the line x + 3y = 7 ?
What is a DNA array?