Introduction

Q.

How is nanometre related to angstrom?

Q.

At what temperature is the root mean square velocity of gaseous hydrogen molecules is equal to that of oxygen molecules at ${47}^{\circ }C$

1. 20 K

2. 3 K

3. 80 K

4. - 73 K

Q. Convert $\frac{\pi }{4}$ radians to degrees

1. ${30}^{\circ }$
2. ${45}^{\circ }$
3. ${60}^{\circ }$
4. ${80}^{\circ }$

Q.

How do you convert 60 degrees to radians?

Q.

How do you convert $90$ degrees to radians?

Q. 2 litre water at 27 ^°C is heated by a 1kW heater in an open container . On an average heat is lost to surrounding at the rate 160 J/s. The time required for the temperature to reach 77 ^°C is

Q.

The initial speed of bullet fires from a rifle is 630m /s . The rifle is fired at the centre of a target 700m away at the same level as the target. How far above the centre of the target the rifle must be aimed in order to hit the target

Q. 7. Entropy change in SPONTANEOUS adiabatic process Entropy change in REVERSIBLE adiabatic process Entropy change in IRREVERSIBLE adiabatic process

Q. what is integrated rate law for first order gas reaction

Q. Two equal positive point charges q1 = q2 =2.0 μC are located at x = 0, y = 0.30 m and x = 0, y = --0.30 m, respectively. What are the magnitude and the direction of the net electric force that these charges exert on a third point charge Q = 4.0 μC at x = 0.40 m, y = 0?

Q. what is the degree of freedom of rigid and non rigid diatomic gas? what is the vibrational degree of freedom of linear and non linear triatomic gas? what is degree of freedom of CO_2?

Q. Convert $\frac{\pi }{6}$, $5\pi$ radians to degrees

1. $30°,900°$
2. $60°,300°$
3. $90°,100°$
4. $100°,100°$

Q.

To what tempreture should the hydrogen at ${327}^{\circ }C$ be cooled at constant pressure, so that root mean square velocity of its molecules become half of its previous value

1. 123°C

2. - 123°C

3. - 100°C

4. 0°C

Q. One second is equal to

1. $1650763.73$ time periods of $\text{Kr}$ clock.
2. $652189.63$ time periods of $\text{Kr}$ clock.
3. $1650763.73$ time periods of $\text{Cs}$ clock.
4. $9192631770$ time periods of $\text{Cs}$ clock.

Q. Explain this statement clearly : “To call a dimensional quantity ‘large’ or ‘small’ is meaningless without specifying a standard for comparison”. In view of this, reframe the following statements wherever necessary : (a) atoms are very small objects (b) a jet plane moves with great speed (c) the mass of Jupiter is very large (d) the air inside this room contains a large number of molecules (e) a proton is much more massive than an electron (f) the speed of sound is much smaller than the speed of light.

Q. If 10^18 electrons are taken out every second from a body, then how much time is required to get a total charge of 0.1 C from it?

Q. Check the given relation is dimensionally correct or not. P=3fv²/t²x Where p equal pressure .f=force, v=velocity, X equal distance , t=time

Q. 85.A slender homogeneous rod of length 2L floats partly immersed in water being supported by a string fastened to one of its end. The specific gravity of the rod is 0.75 . The length of rod that extends out of water is

Q. The mass percentage composition of dry air at sea level contains approximately 75.5% N2. If the total atmospheric pressure is 1 atm , then the partial pressure of nitrogen in (a)0.91atm (b)0.56atm (c)0.66atm (d)0.78atm

Q. Convert the angles in radians
i. ${120}^{\circ }$
ii. ${270}^{\circ }$

1. $\frac{2\pi }{3},\frac{3\pi }{2}$
2. $\frac{\pi }{12},\frac{2\pi }{3}$
3. $\frac{\pi }{6},\frac{\pi }{3}$
4. $\frac{\pi }{3},\frac{\pi }{6}$

Q. A wheel of moment of inertia 5 × 10–3 kgm2 is making 20 rev/s. The torque required to stop it in 10 s is- Options: a- 2 × 10–2 Nm b- 2 × 102 Nm c- 4 × 10–2 Nm d- 4 × 102 Nm

Q. One end of a uniform rod of mass m and length l isclamped. The rod lies on a smooth horizontal surfaceand rotates on it about the clamped end at a uniformangular velocity o. The force exerted by the clamp onthe rod has a horizontal component(a) mω^2 l(b) zero(c) mg (d) 0.5 mω^2

Q. The product of resistivity and coductivity depends on

Q. Three vectors A, B andC add up to zero. Findwhich is false.(a)(AX B)XC is not zero unless B, C are parallel.(b)(Ax B) C is not zero unless B, C are parallel.(c) If A, B, C define a plane, (Ax B)xC is inthat plane.(d) (AxB)-C= AB\vert C-c A2 + B2

Q. Position Vector $\overrightarrow{A}$ is $2\hat{i}$ and position vector $\overrightarrow{B}$ is $3\hat{j}$. Here $\hat{i},\hat{j},\hat{k}$ are unit vectors along x, y and z axes as shown in figure. Then $-4\overrightarrow{A}$ can be represented by

1. 
2. 
3. 
4. 

Q. Which of the following is/are true ?
According to standardization of physical quantity, quantities
(i) should be accurately defined.
(ii) should have suitable size
(iii) should not change with time and condition.
(iv) should be easy to access and reproduce

1. (i) & (ii)
2. (i), (ii) & (iv)
3. (i), (ii), (iii) & (iv)
4. (ii), (iii) & (iv)

Q.

A ring has greater moment of inertia than a circular disc of same mass and radius, about an axis passing through its centre of mass perpendicular to its plane, because

1. because the ring needs greater inertia to bend it

2. all mass is at maximum distance from axis

3. because the centre of the ring does not lie on it

4. because the moment produced in the ring is more

Q.

Which of the following (s) is carried by the waves in moving from one place to another?

1. Mass

2. Momentum

3. Disturbance

4. Energy

Q. A particle will leave a vertical circle of radius r, when its velocity at the lowest point of the circle is

Q. 70. A very flexible uniform chain of mass M and length L is suspended vertically such that its lower end just touches surface of table.when upper end of chain is released, it falls with each link coming to rest the instant it strikes the table.Find force exerted by the chain on table at moment when y part of chain has already comes to rest on table