Class XI (PCB) - Online Scholarship Test - MCQ

Three containers of same base area, same height are filled with three different liquids of same mass as shown in the figure. If F₁, F₂, F₃ are the force exerted by the liquid on the base of the container in case I, II and III respectively, then we have the relation:

Temperature at which Fahrenheit and kelvin pair of scales give the same reading will be:

Two springs are in a series combination and are attached to a block of mass m which is in equilibrium. The spring constants and the extensions in the springs are as shown in the figure. Then the force exerted by the spring on the block is :

A cubical block of side  a  and density  ρ  slides over a fixed inclined plane with constant velocity  v  . There is a thin film of viscous fluid of thickness  t  between the plane and the
block . Then the coefficient of viscosity of the thin film will be : (Acceleration due to gravity is g)

Figure shows the velocity time graph of a particle moving along straight line (v is m/s and t is in seconds). Its average velocity in 20 seconds will be :

In a cyclic process ABCA for an ideal gas. In AB, BC and CA process 50 J, 20 J and 5 J heat is supplied to an ideal gas. In process AB internal energy of gas increases by 60 J and in process BC work done by gas is 30 J. The increase in internal energy of gas in process CA is :

Consider the following statements :
(i) Young's modulus is numerically equal to the stress which will double the length of a wire
(ii) Viscosity of gases is greater than that of liquids.
(iii) The surface tension of a liquid decreases due to the presence of insoluble contamination. The number of above statements that are true is

A massless conical flask filled with a liquid is kept on a table in a vacuum. the force exerted by the liquid on the base of the flask is W₁. The force exerted by the flask on the table is W₂.

The ratio of period of oscillation of the conical pendulum to that of the simple pendulum is. (Assume the strings are of the same length in the two cases and θ is the angle made by the string with the vertical in case of conical pendulum.)

A system of uniform cylinders and plates is shown in figure. All the cylinders are identical and there is no slipping at any contact. Velocity of lower & upper plate is V and 2V respectively as shown in figure. Then the ratio of angular speed of the upper cylinders to lower cylinders is

S₁, S₂ are two coherent sources (having initial phase difference zero) of sound located alongx-axis separated by 4 λ where λ is wavelength of sound emitted by them. Number of maxima located on the elliptical boundary around it will be :

The Vander waal equation for 1 mole of a real gas is   (V – b) = RT  where P is the pressure, V is the volume, T is the absolute temperature,R is the molar gas constant and a, b are Vander waal constants. The dimensions of a are the same as those of

Which of the following statements is not a correct statement about the trends when going from left to right across the periods of peridic Table -

Which of the following electronic configurations indicates the biggest jump between the second and third ionisation energy values ?

Maximum number of electrons that can be filled in M-shell of an atom is

Which of the following element has highest Ist ionisation potential :

An atom of an element has 11 protons and has a mass number 23. The nucleus of this atom contains .......... neutrons.

Number of bonds present in N₂ molecule :

Which oil is used as frother in froth floatation process ?

Which of the following contains both ionic and covalent bond ?

500 ml vessel contains 1.5 M each of A, B, C and D at equilibrium. If 0.5 moles each of C and D are taken out, the value of K_c for A B   C D will be : (at constant temperature)

X ml of H₂ gas effuses through a hole in a container in 5 seconds. The time taken for the effusion of the same volume of the gas specified below under identical conditions is :

Which is false about bacteria -

co-factors are -

Which of the following are function of mesosome

Enzymes are sensitive to -

In man, intestinal haustra are