Q.1 A particle travelling in a horizontal straight line has an acceleration of 2m/s2?
A. Its total mechanical energy is constant
B. The particle is doing the work
C. Its potential energy is not constant
D. Work is done on the particle
Ans. Work is done on the particle
Q.2 All the particles of a body are situated at a distance R from the origin. The distance of the center of mass of the body from the origin is
Q.3 An ice box made if 1.5cm thick Styrofoam has dimensions 60cmX30cm. It contains ice at 0°C and is kept in a room at 40°C. Find the rate at which the ice is melting . Latent heat of fusion of ice =3.36X105 J/kg and thermal conductivity of Styrofoam=0.4W/m-°C.
Q.4 A particle is projected up with an initial velocity of 80ft/sec. The particle will be at height of 96ft from the ground after (take g=32ft/sec2)
A. after 1 and 2sec
B. only at 3 sec
C. only at 2sec
D. 2sec and 3sec
Ans. 2sec and 3sec
Q.5 The potential energy (in joule) of a body of mass 2kg moving in x-y plane is given by U=6x+8y, where x and y are in meters. If the body is at rest at point (6m, 4m) at time t=0, it will cross y-axis at the time t equals to
Q.6 A body is thrown horizontally with a velocity √(2gh) from the top of a tower of height h. It strikes the level ground through the foot of the tower at a distance x from he tower. The value of x is
Q.7 How many stereoisomers are possible from C2H 2Cl2 :-
Q.8 The heat generated in a circuit is given by H=I2Rt joule where I is current, R is the resistance and t is the time. If the percentage error in measuring I,R and t are 2%, 1% and 1% respectively. The maximum error in measuring heat will be
Q.9 Rain is falling vertically with a speed of 20m/s. A person is running in the rain with the velocity of 5m/s and a wind is also blowing with a speed of 15m/s(from west). The angle with the vertical at which the person should hold his umbrella is
Q.10 Alicyclic compound are?
A. Aromatic compounds
B. Aliphatic cyclic compound
C. Heterocyclic compound
D. none of these
Ans. Aliphatic cyclic compound
Q.11 If in Bohr's model for unielectronic atom time period of revolution is represented as T n,z where n represents shell no. and z represents atomic number then the value of T 2,1 : T 2,1 will be :-
B. 1 : 8
Q.12 Calculate the [OH < sup>- in 0.01 M aqueous solution of NaOCN (Kb for OCN< sup>- = 10-10):-
A. 10-6 M
B. 10-7 M
C. 10-8 M
D. none of these
Ans. 10-6 M
Q.13 In saturated solution of H2S decreasing the pH of the solution will cause :-
A. The S2- concentration to decrease
B. The H2S concentration to decreases
C. The S2- concentration to increases
D. No change in either the The H2S or S2- concentration .
Ans. The S2- concentration to decrease
Q.14 The rusting of iron takes place as follows , 2H + + 2e - + 1/2 O 2 ----> H2 (liq) E 0 = + 1.23 V ; Fe2+ + 2e - ---->Fe (s) E 0 = -0.44 V The ΔG 0 for the net process is ?