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Questions and Answers
Which is the correct age in years according to the given information?
In which phenomenon does a substance formed in a reaction act as a catalyst?
What does the green flame of organic compounds in Beilstein's test indicate the presence of?
What is the percentage of bromine in the organic compound if 0.207 gram of it gave 0.282 gram of silver bromide?
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In which type of reactions is carbocation intermediate involved?
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Which mechanism is involved in the preparation of glycol from 1,2-dihaloethane using aqueous Na2CO3?
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What is the product formed in the given reaction?
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How does the presence of a nitro group in a benzene ring impact electrophilic substitution?
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What does hydrolysis of diazonium salt produce?
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In the Williamsons synthesis for the preparation of __________, the compounds used are
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What product is formed when acetonitrile is partially hydrolyzed with cold concentrated HCl?
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Which compound cannot react with nitrous acid?
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Which statement about addition polymers is correct?
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What is the relationship between the number of purine nucleotides and pyrimidine nucleotides in each unit of DNA?
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Which of the following is both unitless and dimensionless?
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Study Notes
Here are the study notes for the provided text:
Physics
- Refractive Index: Refractive index is both unitless and dimensionless.
- Astronomical Units: 1 meter is equal to 6.68 × 10^(-12) astronomical units.
- Lift and Gravity: When a lift is moving up with an acceleration equal to 1/5 of that due to gravity, the apparent weight of a 60 kg man standing in the lift is 72 kg wt.
- Friction of Air: The friction of air causes a vertical resistance of 10% in acceleration due to gravity, which decreases the maximum height by 9%.
- Projectile Motion: A projectile can have the same range R for two angles of projection, and the product of the two times of flight is t1 t2 = R.
- Circular Motion: A body moving with a constant speed 'V' in a circle of radius r has an angular acceleration of zero.
- Satellites: If the total energy of an earth's satellite is zero, it means that the satellite moves away from the orbit along a parabolic path.
- Weight and Height: The weight of a body decreases with an increase in height from the earth's surface.
- Tuning Fork: A tuning fork arrangement produces 4 beats/second with one fork of frequency 288 Hz, and if a little wax is applied on the unknown fork, it produces 2 beats/s, then the frequency of the unknown fork is 292 Hz.
- Simple Harmonic Motion: The phase difference between velocity and acceleration of a particle executing SHM is 90 degrees.
- Sound Waves: The time taken to hear the sound of a stone dropped into a lake from a 500m high tower is approximately 11.5 seconds.
Chemistry
- Gases: The atomicity of a gas with R = 2/5 Cv is diatomic.
- Refrigeration: In a refrigerator, the internal energy of the system drops by 5000KJ, and the net heat transfer for the system is -8.6 KJ.
- Thermodynamics: The ratio of the radii of the nuclei of 13Al and 52Te is approximately 6:10.
Atomic Physics
- Hydrogen Atom: If the ionizing energy of H atom is 13.6 eV, then the second ionizing energy of He should be 54.4 eV.
- Photoelectric Effect: The ratio of the maximum velocity of photoelectrons emitted in the two cases when radiation of two photons having energies twice and five times the work function of a metal are incident successively on the metal surface is 1/2.
Nuclear Physics
- Radioactivity: The activity of C14 of an ancient wooden boat shows an activity of 3.9 disintegrations per minute per gm of carbon, and the half-life of C14 is 5.568 years.
Other Topics
- Units and Measurements: One mole of oxygen gas at STP is equal to 6.022 × 10^(23) atoms of oxygen.
- Physical Chemistry: The degree of dissociation of 0.1 M HCN solution is 0.01%, and its ionization constant is 10^(-9).
- Organic Chemistry: The mechanism involved in the preparation of glycol from 1,2-dihaloethane using aqueous Na2CO3 is SN2 attack by OH^(-).
- Biology: Each unit of DNA has a number of purine nucleotides equal to the number of pyrimidine nucleotides.
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Description
A physics quiz from SRMJEEE 2019, covering topics such as units, dimensions, and forces.
