Syllogism Basic concept | न्याय निगमन | L-1 | Reasoning | Best Method

Assertion : Surgical methods of contraception are practiced to space two successive conceptions. Reason : During surgical methods, ovaries from females or testes from males are removed.

Assertion : As long as the mother breast-feeds the child fully, chances of conception are almost nil Reason : Lactational amenorrhea method is based on the fact that ovulation does not occur during the period of intense lactation

Assertion: In displacement method of finding focal length of a convex lens its magnification in one position of lens is +2, then magnification in another position of lens should be -1/2. Reason:This method can't be applied for a concave lens.

Assertion At the same temperature and pressure, equal volums of all gases gases contain equal numbe of molecules. Reason In 1 L at NTP total number of molecules are 6.02xx10^(23).

Assertion: If the lines (x-1)/(-3)=(y-2)/(2k)=(z-3)/2 and (x-1)/(3k)=(y-1)/1=(z-6)/(-5) are perpendicular to each other , then k=10/7 , Reason: Two lines having diection ratios l_1,m_1,n_1 and l_2,m_2,n_2 are perpendiculr to each other if and only if l_1l_2+m_1m_2+n_1n_2=0 (A) Both A and R are true and R is the correct explanation of A (B) Both A and R are true R is not the correct explanation of A (C) A is true but R is false. (D) A is false but R is true.

Assertion : A single outcross often helps to overcome inbreeding depression. Reason : Out-crossing is best breeding method for increasing milk productivity.

Delta_(f)H^(Theta) of Cyclohexene (l) and benzene at 25^(@)C is -156 and +46 kJmol^(-1) , respectively. Delta_("hydrogenation")H^(Theta) of cyclohexene (l) at 25^(@)C is -119 kJ mol^(-1) . Reasonance energy of benzene is found to be -38x kJ mol^(-1) . Find the value of x .

A tuning fork of frequency 480 Hz is used in an experiment for measuring speed of sound (v) in air by resonance tube method. Resonance is observed to occur at two successive lengths of the air column, l_(1) = 30 cm and l_(2) = 70 cm . Then, v is equal to :

From the list of characteristics given below, select the five which are relevant to non-metals and their compounds : A Ductile B Conduct electricity C Brittle D Acidic oxides E Basic oxides F Discharged at anode G Discharged at cathode H lonic chlorides 1 Covalent chlorides J Reaction with dilute sulphuric acid yields hydrogen K 1, 2 or 3 valence electrons L 5, 6 or 7 valence electrons (Write the five letters corresponding to the correct characteristics)