If the lattice parameter for a crystalline structure is 3.6 A, then atomic radius in fcc crystal is
1.18 A
2.10 A
2.92 A
2.92 A
If the error in the measurement of radius of sphere is 2%, then the error in the determination of volume of the sphere will be
4%
6%
8%
8%
A roller coaster is designed such that riders experience " weightlessness" as they go round the top of a hill whose radius of curvature is 20 m. The speed of the car at the top of the hill is between
14 m/s and 15 m/s
15m/s and 16 m/s
16 m/s and 17 m/s
16 m/s and 17 m/s
The ratio of the radii of gyration of a circular disc to that of a circular ring, each of same mass and radius, around their respective axes is
Water falls from a height of 60 m at the rate of 15 kg /s to operate a turbine. The losses due to frictional
8.1 kW
10.2 kW
12.3 kW
12.3 kW
The distance travelled by a particle starting from rest and moving with an acceleration 4/3 ms^{-2} in the third second is
6 m
4 m
10/3
10/3
A particle shows distance -time curve as given in this figure. The maximum instantaneous velocity of the particle is around the point
B
C
D
D
A closed loop PQRS carrying a current is placed in a uniform magnetic field. If the magnetic forces on segments PS, SR and RQ are F_{1}, F_{2} and F_{3} respectively and are in the plane of the paper and along the directions shown, the force on the segment of QP is
F_{3} - F_{1}-F_{2}
Three forces acting on a body are shown in the figure. To have the resultant force only along the y-direction, the magnitude of the minimum additional force needed is
0.5 N
1.5 N
A shell of mass 200 g is ejected from a gun of mass 4 g by an explosion that generates 1.05 kJ of energy. The initial velocity of the shell is
100 ms^{-1}
80 ms^{-1}
40 ms^{-1}
40 ms^{-1}