To store the electric charge the ultra-capacitors use _____ effect
- Quadruple layer
- Single layer
- Triple layer
- Double layer
A capacitor of capacitance ‘C’ has a charge ‘Q’ and stored energy is ‘w’. If the charge is increased to ‘2Q’. The stored energy will be:
- W/2
- W/4
- 2W
- 4W
The resistance of the wire varies inversely as:
- Temperature
- Length
- Area of cross section
- Resistivity
What is the molecular formula of pyridine molecule
- C6H6N
- C5H5N
- C5H5NH
- C6H5N
Which of the functional group are present in ethyl acetate
- Ester group
- Aldehyde group
- Ether group
- Carboxyl group
Which of the following is correct electronic configuration of iron (II) ion (atomic no. of Fe is = 26 )
- [ Ar ] 4s2, 3d6
- [ Ar ] 4s0, 3d6
- [ Ar ] 4s2, 3d5
- [ Ar ] 4s2, 3d4
Which one of them is amphoteric in nature
- Potassium oxide
- Lithium oxide
- Beryllium oxide
- Calcium oxide
The electronic configurations of some elements are given below. Recognize the element that belongs to group IIIA
- 1s2 2s2 2p4
- 1s2 2s2 2p3
- 1s2 2s2 2p1
- 1s2 2s2 2p2
Which of the following has the highest atomic radius in its period
- Alkaline earth metals
- Halogens
- Chalcogens
- Alkali metals
Select the metal which is extracted from bauxite
- Ca
- Mg
- Cu
- Al
