List of practice Questions

The phrase Omnis cellula e cellula, or cells arise from pre-existing cells was proposed by

Growth of a Plant in response to a light stimulus is known as

Transfer of pollen grains from anther to stigma of the same flower is called ____ .

A potentiometer with a cell of 2.4 volts and internal resistance of 2 Ω maintains potential drop across the resistance wire AB of length 2 m and resistance 10 Ω. A standard cell that maintains a constant EMF of ‘V’ volt with an internal resistance of 0.2 gives a balance point at 1.6 M length of the wire. The value of EMF of the second (standard) cell(V) is:

If A is a skew symmetric matrx, then \(A^ {2021}\) is

Which of the following artificial sweeteners can be used in soft drinks only?

The equilibrium constant, \(K_C\) for \(3C_2H_2(g) \rightleftharpoons C_6H_6(g)\) is 4 L\(^2\)mol\(^{-2}\). If the equilibrium concentration of benzene is 0.5 mol/L, then what is the value of concentration of ethylene?

A commercially sold conc. HCl is 35% HCl by mass. If the density of this commercial acid is 1.46 g/mL, the molarity of this solution is :
(Atomic mass : Cl = 35.5 amu, H = 1 amu)

Let L₁ be the line joining (0, 0, 0) and (1, 2, 3) and L₂ be the line joining (2, 3, 4) and (3, 4, 5). The point of intersection of L₁ and L₂ is

Which property of CO₂ makes it biologically and geo-Chemically important?

A DC ammeter and a hot wire ammeter are connected to a circuit in series. When a direct current is passed through the circuit, the DC ammeter shows 6A. When AC current flows through the circuit, what is the average reading in DC ammeter and the AC ammeter, if DC and AC currents flow simultaneously through the circuit?

A bullet of mass \( m \) hits a mass \( M \) and gets embedded in it. If the block rises to a height \( h \) as a result of this collision, the velocity of the bullet before collision is

A particle of mass \( m \) is moving in a horizontal circle of radius \( r \) under a centripetal force given by \( \left( \frac{-K}{r^2} \right) \), where \( K \) is a constant. Then

The height at which the acceleration due to gravity becomes \( \frac{g}{16} \) (where \( g \) is the acceleration due to gravity on the surface of the earth) in terms of \( R \), if \( R \) is the radius of the Earth.

Which of the following series spectrum of hydrogen atom lies in ultraviolet region?

Speed of electromagnetic wave in a medium having relative permittivity \( \epsilon_r \) and relative permeability \( \mu_r \) is (speed of light in air, \( c = 3 \times 10^8 \, \text{m/s} \))

The wavelength of the second line of the Balmer series is 486.4 nm. What is the wavelength of the first line of Lyman series?

A bat emitting an ultrasonic wave of frequency \( 4.5 \times 10^4 \, \text{Hz} \) at speed of \( 6 \, \text{m/s} \) between two parallel walls. The two frequencies heard by the bat will be

A disc of moment of inertia 4 kg \( \text{m}^2 \) revolving with 16 rad/s is placed on another disc of moment of inertia 8 kg \( \text{m}^2 \) revolving with 4 rad/s. The angular frequency of the composite disc is

An electric current \( I \) enters and leaves a uniform circular wire of radius \( r \) through diametrically opposite points. A charged particle \( q \) moves along the axis of the circular wire and passes through its center with speed \( v \). The magnetic force on the particle when it passes through the center has a magnitude

Television frequencies are of the order of 100 MHz, while radio frequencies are of the order of 1 MHz. Using these as typical frequencies, the ratio of the emf generated in a loop antenna by a television wave to that generated by a radio wave, if both have equal electric field intensities, is

A particle is performing simple harmonic motion. Equation of its motion is \( x = 5 \sin \left( 4t - \frac{\pi}{6} \right) \), \( x \) being the displacement from the mean position. Velocity (in ms\(^{-1}\)) of the particle at the instant when its displacement is 3, will be

A raft of density 600 g/m\(^3\) and mass 120 kg floats in water. How much weight can be put on the raft to make it just sink?