Maths-
General
Easy
Question
Focus and directrix of the parabola 
The correct answer is:
The given equation is
Here, A a = 2 . Thus, the focus of the parabola is (0 − A), that is, (0, − 2a). The directrix is y = A, that is, y = 2a.
Related Questions to study
Maths-
If the vertex of a parabola be at origin and directrix be x + = 5 0, then its latus rectum is
If the vertex of a parabola be at origin and directrix be x + = 5 0, then its latus rectum is
Maths-General
10th-Grade-Math---USA
125, 80, 140, 135, 126, 140, 350, 75
Maximum value of given data _______________
125, 80, 140, 135, 126, 140, 350, 75
Maximum value of given data _______________
10th-Grade-Math---USAGeneral
Chemistry-
reaction is favoured by:
reaction is favoured by:
Chemistry-General
Chemistry-
Order of base strength of the compounds :
I) 
II) 
III) 
IV) 
Order of base strength of the compounds :
I)
II)
III)
IV)
Chemistry-General
Chemistry-
The stability of the following carbocation decreases in the order:
I) 
II) 
III) 
IV) 
The stability of the following carbocation decreases in the order:
I)
II)
III)
IV)
Chemistry-General
Chemistry-
Which of the following orders is correct for the ease of electrophile addition on these alkenes?
I) 
II) 
III) 
Which of the following orders is correct for the ease of electrophile addition on these alkenes?
I)
II)
III)
Chemistry-General
Chemistry-
H for CaCO3(s) 
CaO(s) + CO2(g) is 176 kJ mol–1 at 1240 K. The E for the change is equal to
H for CaCO3(s) CaO(s) + CO2(g) is 176 kJ mol–1 at 1240 K. The E for the change is equal to
Chemistry-General
Chemistry-
The heat evolved in combustion if 112 litres of water gas (mixture of equal volume of H2(g) and CO(g) is
H2(g) + 1/2 O2(g) = H2O(g) H = –241.8 kJ
CO(g) + 1/2 O2(g) = CO2(g) H = –283 kJ
The heat evolved in combustion if 112 litres of water gas (mixture of equal volume of H2(g) and CO(g) is
H2(g) + 1/2 O2(g) = H2O(g) H = –241.8 kJ
CO(g) + 1/2 O2(g) = CO2(g) H = –283 kJ
Chemistry-General
Chemistry-
(1) For the given heat of reaction,
i) C(s) + O2(g) = CO2(g) + 97 kcal
ii) CO2(g) + C(s) = 2CO(g) – 39 kcal the heat of combustion of CO(g) is:
(1) For the given heat of reaction,
i) C(s) + O2(g) = CO2(g) + 97 kcal
ii) CO2(g) + C(s) = 2CO(g) – 39 kcal the heat of combustion of CO(g) is:
Chemistry-General
Chemistry-
A solution of CuSO4 is electrolysed using platinum inert electrodes. Due to electrolysis, the colour changes from blue to _________ and pH of the solution ________.
A solution of CuSO4 is electrolysed using platinum inert electrodes. Due to electrolysis, the colour changes from blue to _________ and pH of the solution ________.
Chemistry-General
Chemistry-
Chemistry-General
Chemistry-
An electrophilic reagent is:
An electrophilic reagent is:
Chemistry-General
Chemistry-
Which one of the following is a free radical?
Which one of the following is a free radical?
Chemistry-General
Chemistry-
In acidic medium Cr2O72– is converted to Cr3+ when it acts as an oxidising agent. The quantity of electricity required to reduce 0.05 mole of Cr2O72– would be
In acidic medium Cr2O72– is converted to Cr3+ when it acts as an oxidising agent. The quantity of electricity required to reduce 0.05 mole of Cr2O72– would be
Chemistry-General
Chemistry-
One of the constituent of german silver is
One of the constituent of german silver is
Chemistry-General
