Practice Set 1
Physics
Que1
The dimensional formula for torque is
[ML^2T^-2] Its proper SI unit is
1) joule only
2) either N-m or joule
3) N-m
4) none of above
Ans (3)
Que 2
A particle is moving in a straight line with constant velocity of 3 m/s at t =0 force starts acting on the particle in a direction perpendicular to the direction of its initial motion which causes an acceleration of 1m/s^2 Determine the magnitude of particles velocity at t = 3 seconds
1) 3m/s
2) 6m/s
3) 3√2m/s
4) 2√3m/s
Ans (3)
Que 3
A child pushes a toy box 4 m along the floor by means of a force of 6 Newton directed downward at an angle of 37° to the horizontal How much work does the child do?
1) 18 J
2) 19.2 J
3) 14.4 J
4) None of these
Ans (2)
Que 4
A thin ring of mass 2.7 kg and radius 8 cm rotates about an axis through its centre and perpendicular to the plane of the ring at 1.5 rev/sec calculate the kinetic energy of the ring?
1) 0.763 J
2) 0.345 J
3) 1.5 J
4) zero
Ans (1)
Que 5
A particle is moving in xy plane whose position vectors are given as a function of time
X= 2-(0.25)t^2
Y=(1)t+(0.025)t^3
Find the unit vector along particle velocity at time =2 sec
1)(i+2.2j)/2.42
2) (-i+1.3j)/1.64
3) j
4)(k+j)/√2
Ans (2)
Que 6
Two particles each having a charge of 10 ×10^-6 is placed at a separation of 2 metre what will be the work done by external force in pulling them apart slowly by 1 m so that new separation becomes 3 m?
1) 1.5 J
2) 0.15 J
3) -0.15J
4) -1.5 J
Ans (2)
Que 7
Earth satellite of mass M circles the earth with speed u by how much does its momentum change as it goes halfway around the earth?
1) Mu
2) 2Mu
3)√2Mu
4) 2√2Mu
Ans (2)
Que 8
Whenever a photon is emitted by hydrogen atom in balmer series it is followed by another Photon in lyman series what wavelength does this later Photon corresponds to
1) 103nm
2) 122 nm
3) 91.3nm
4) it can have any value
Ans (2)
Que 9
A constant current of 2.8 A exist in a resistor the RMS current is
1) 2.8 A
2) 2A
3) 1.4 A
4) undefined
Ans (1)
Que 10
A steel rod has a radius of 10 mm and length of 1 m a force of 100 Newton stretches it along its length young modulus of steel is 2× 10^11N/m^2 find the value of elastic energy density stored
1) 1.59×10^3
2) 1.6
3) 3.18×10^8
4)2.53×10^5
Ans (3)
Chemistry
1) A2B3
2) AB3
3)A3B
4)A3B2
Ans ( 2)
Que 7
The vapour pressure of pure liquid solvent A is 0.80 atm when a non volatile substance B is added to the solvent its vapour pressure drops to 0.60 atm what is the mole fraction of the component B in the solution?
1) 0.75
2) 0.25
3) 0.40
4) 0.60
Ans (2)
Que 8
Zwitter ion stabilizers into conjugate acid
1) low pH
2) high pH
3) intermediate pH
4) isoelectric point
Ans (1)
Que 9
Which type of defect has the presence of cations in the interstitial sites?
1) Schottky defect
2) Vacancy defect
3) Frenkel defect
4) Metal deficiency defect
Ans (3)
Que 10
Total number of lone pairs of electrons in
(I3)^-1 ion is
1) 3
2) 6
3) 9
4) 12
Ans (3)
