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Which one of the following cannot represent a traveling wave/
y ym sin k (x t
y f (x t
y ym log (x t)
y f (x2 t2)
Capacitance acts to store electrical energy as
Voltage
a magnetic field.
an electric field
Current
The energy resides in a current carrying conductor in the form of
Magnetic field
Electrostatic field
Thermal vibration
both (b) and (c)
Which metal is used to harden oils when making margarine
Silver
Gold
Nickel
Iron
A crystal is defined as a solid figure which has a definite geometrical shape with ……………. faces and ……………. edges
NONE OF THESE
sharp, sharp
flat, sharp
donot, sharp
Which of the following reagents and conditions would best serve to convert 1-butyne to 1,1-dibromobutane
2 equivalents of Br2 followed by i equivalent of KOH. ________________________________________
1 equivalent of Br2.
2 equivalents of HBr, no peroxides
2 equivalents of HBr, with peroxides.
A disk of radius a/4 having a uniformly distributed charge 6C is placed in the x-y plane with its centre at (−a/2,0, 0). A rod of length a carrying a uniformly distributed charge 8C is placed on the x-axis from x =a/4 to x = 5a/4. Two point charges −7C and 3C are placed at
(a/4, −a/4,0) and (−3a/4, 3a/4, 0),respectively.
Consider a cubical surface formed by six surfaces x =
0−2Cε
012Cε
010Cε
02Cε
How many structural isomers are possible with the molecular formula C6H14
5
4
6
7
The conjugate acid of NH2- is
NH4+
N2H4
NH4OH
NH3
64g of HI are present in a 2 litrevessel.
The active mass of HI is
1
0.25
None
0.5
Which of the following is the unit for Pressure?
I. Pa
II. Nm
III.
N/m2
II and III only
III only
I and III only
I only
If butan-1-ol is treated with concentrated phosphoric acid and the product is treated with HBr, you get___
but-1-ene
2-bromobutane only
1-bromobutane only
a mixture of 1-bromobutane and 2-bromobutane
Calculate the pressure exerted by 10–23 gas molecules, each of mass 10–22 g in a container of volume onelitre.
The rms speed is 105 cm sec–1
P = 5.3 × 17dyne cm–2
P = 13.3 × 107dyne cm–2
NONE OF THESE
P = 3.3 × 107dyne cm–2
When HOBr adds to 4-methylcyclopentene, how many new stereogenic centers are formed
1
2
3
4
car's engine is 20%efficient.
When cruising, the car encounters an average retarding force of 1000 N. If the energy content of gasoline is 40 megajoules per liter, how many kilometers per liter does the car get
14
12
10
8
A step-down transformer is designed to work in a 12 V lamp from a 220 Vsupply.
If the primary coil has 900 turns, what is the number of turns in the secondary coil
9
98
49
50
Absolute zero is defined as the temperature__________
All of the above
at which liquid helium boils
at which ether boils
at which all molecular motion ceases
The proper name for the inability to focus in different planes is
glaucoma
presbyopia
hypermetropia
Astigmatism
Limestone decomposes to form calcium oxide and carbondioxide.
What is the mass of limestone required to produced 84.0 kg of calcium oxide
1000 kg
150 kg
840 kg
1500 kg
The conversion of methane into chloromethane in the presence of UV light is an example of____
electrophilic addition
elimination
Free radical substitution
Nucleophilic substitution
What are the conditions for dehydration of alcohols
A certain sample of gas has a volume of 0.2 litre measured to 1atm.
Pressure and 0°C. At the same pressure but at 273°C, its volume will be
27.8 litre
55.6 litre
0.4 litre
0.8 litre
What is the ideal efficiency of a heat engine that has a hot reservoir at 500 K and a cold reservoir of 200 K
40%
55%
50%
60%
Pure (S)-2-butanol has a specific rotation of 13.52degrees.
You have made and purified a sample that has a calculated specific rotation of 6.76degrees.
What can you conclude about this sample
75% of the sample has racemized
50% of the sample has racemized
50% the sample has rearranged into a meso isomer
The sample has completely racemized
For the reactionPCl5 (g) ↔ PCl3 (g) Cl2 (g)
introducing PCl5 at constant volume.
introducing chlorine gas at constant volume
introducing an inert gas at constant volume.
introducing an inert gas at constant pressure.
The radius of A is 95 pm and that of B- ion is 181 pm. Hence the coordination number of A will be
8
4
Un predictable
6
Differential scanning calorimetry
(DSC) is a technique to measure ------
Impact energy
Electrical conductivity
specific heat
thermal expansion
A body cools from 100°C to 70°C in 8minutes.
If the room temperature is 15°C and assuming Newton’s law of cooling holds good, then time required for the body to cool from 70°C to 40°C is
10 s
8 s
14 s
5 s
Assuming that Hund’s rule is violated, the bond order and magnetic nature of the diatomic molecule B2 is
0 and paramagnetic
0 and diamagnetic
1 and diamagnetic
1 and paramagnetic
The formula of an oxide of copper isCu2O.
What is the mass of oxygen needed to combined with 64 g of copper in this compound
NONE OF THESE
45.0 g
30.0 g
15.00 g
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