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A spring of force constant $k$ is cut into lengths of ratio $1:2:3$. They are connected in series and the new force constant is $k'$. Then they are connected in parallel and the force constant is $k''$. Then $k':k''$ is:
Two cars moving in opposite directions approach each other with speed of $22 \text{ m/s}$ and $16.5 \text{ m/s}$ respectively. The driver of the first car blows a horn having a frequency $400 \text{ Hz}$. The frequency heard by the driver of the second car is [velocity of sound $340 \text{ m/s}$]
Find the value of the angle of emergence from the prism given below for the incidence ray shown. The refractive index of the glass is $\sqrt{3}$.
The mixture which shows positive deviation from Raoult's law is
The rms value of potential difference V shown in the figure is
Match List-I with List-II: List-I 1. DNA fingerprinting 2. Pneumococcus 3. E. coli 4. Bacteriophage List-II I. M. Meselson and F. Stahl II. A. Hershey and M. Chase III. F. Griffith IV. Alec Jeffreys
An intrinsic semiconductor is converted into an n-type extrinsic semiconductor by doping it with:
Two simple harmonic motions of angular frequencies $100$ and $1000 \text{ rad s}^{-1}$ have the same displacement amplitude. The ratio of their maximum acceleration is:
Which factor is important for termination of transcription?
Two particles of masses $m_1, m_2$ move with initial velocities $u_1$ and $u_2$. On collision, one of the particles gets excited to a higher level, after absorbing energy $\varepsilon$. If the final velocities of the particles are $v_1$ and $v_2$, then we must have:
Match List-I with List-II: List-I A. RNA polymerase III B. Termination of transcription C. Splicing of Exons D. TATA box List-II I. snRNPs II. Promoter III. Rho factor IV. snRNAs, tRNA
Which one of the following is not applicable to RNA?
Two points are located at a distance of $10\text{ m}$ and $15\text{ m}$ from the source of oscillation. The period of oscillation is $0.05\text{ s}$ and the velocity of the wave is $300\text{ m/s}$. What is the phase difference between the oscillations of two points?
Mark the name of the reaction associated with the following conversion:
What does "lac" refer to in what we call the lac operon:
The 3'-5' phosphodiester linkages inside a polynucleotide chain serve to join:
Which of the following RNA should be most abundant in an animal cell?
After a mutation at a genetic locus, the character of an organism changes due to the change in:
The displacement of a particle executing simple harmonic motion is given by $y = A_0 + A \sin \omega t + B \cos \omega t$. Then the amplitude of its oscillation is given by:
Which of the following is not the characteristic feature of genetic code?