(a) He and O2 (b) O2 and He (c) He and Ar (d) O2 and N2 Answer-b (138)
PRACTICE TEST
(a) P3 > P1 , W > 0 (b) P3 < P1 , W < 0 (c) P3 > P1 , W < 0 (d) P3 = P1 , W = 0 Ans. …
Q. In a March Past, seven persons are standing in a row. Q is standing left to R but right to P. 0 is standing right to N and left to P. Similarly, S is standing right to R and …
(a) 227°C (b) 327°C (c) 127°C (d) 27°C Answer-c (192)
(a) 7 : 6 (b) 6 : 7 (c) 36 : 49 (d) 49 : 36 Answer-b (159)
Vrms the most probable speed Vmp and the average speed Vav obey the relationship (a) Vav >Vrms > Vmp (b) Vrms >Vav >Vmp (c) Vmp > Vav >Vrms …
(a) 1800°C (b) 162°C (c) 1527°C (d) 600°C Answer-c (87)
(a) At high temperature and low pressure (b) At low temperature and high pressure (c) At normal temperature and pressure (d) None of the above Answer-a (54)
(a) Inelastic rigid sphere (b) Perfectly elastic non-rigid sphere (c) Perfectly elastic rigid sphere (d) Inelastic non-rigid sphere Answer-c (42)
(a) l decreases and h increases (b) l increases and h decreases (c) Both l and h increase (d) Both l and h decrease Answer-d (119)
(a) Curve A (b) Curve B (c) Curve C (d) Curve D Answer-b (46)
(a) The water in the tube rises to height v2 /2g (b) The water in the tube rises to height g/2v2 (c) The water in the tube does not rise at all (d) None of these Answer-a (71)
vA and vB , and pressure PA and PB at points A and B respectively (a) vA = vB (b) vB > vA (c) PA = PB (d) PB > PA Answer- a,d (164)
into 106 droplets is (Surface tension of water= 72 x 10-3 J/m2 (a) 9.58 x 10-5 j (b) 8.95 x 10-5 j (c) 5.89 x 10-5 j (d) 5.98 x 10-6 j Ans. b (252)
(a) (i) B (ii) D (b) (i) C (ii) D (c) (i) B (ii) C (d) (i) B (ii) A Explanation- (a) Due to acceleration towards right, there will be a pseudo force in a left direction. So the pressure …
the diameter of capillary tube (Surface tension of water = 7.2 ×10–2 N/m) (a) 9.6×10–4 m (b) 9.6×10–3 m (c) 9.6×10–2 m (d) 9.6×10–1 m Ans. a (56)
(a) Surface tension of the liquid (b) Density of liquid (c) Viscosity of liquid (d) Temperature of air only Ans. d (102)
(a) Surface tension of the liquid (b) Density of liquid (c) Viscosity of liquid (d) Temperature of air only Ans. a (63)
The position of a particle is given by : →r = (^i+2^j-^k) and momentum →p =(3^i+4^j-2^k) . The angular momentum is perpendicular to (a) X-axis (b) Y-axis (c) Z-axis (d) Line at equal angles to all the three axes Ans. …
a. As a filler b. To increases leathering c. To prevent rapid drying d. To make soap granules Ans. c Explanation : Glycerol is added to shaving soap to prevent rapid drying while to enhance the leathering property of soap …
(a) Drosera and Rafflesia (b) Nepenthes and bladder wart (c) Dionaea and Viscum (d) Venus fly trap and Rafflesia Answer: b (63)
(a) mgR (b) 1/2 mgR (c) 2 mgR (d) 1/4 mgR Answer: b (251)
A flywheel of moment of inertia 0.32 kg–m2 is rotated steadily 120 rad/s at by a 50 w electric motor. The kinetic energy of the flywheel is (a) 4608 J (b) 1152 J (c) 2304J (d) 6912J Ans. …
A metal bar of length L and area of cross-section A is clamped between two rigid supports. For the material of the rod, its Young’s modulus is Y and coefficient of linear expansion is . If the temperature of the …
The escape velocity from earth is ves. A body is projected with velocity 2 ves with what constant velocity will it move in the inter planetary space (a) ves (b) 3ves (c) √3 …
30. Increase in length of a wire is 1 mm when suspended by a weight. If the same weight is suspended on a wire of double its length and double its radius, the increase in length will (a) 2 mm …
25. The spring balance does not read properly after its long use, because (a) The elasticity of spring increases (b) The elasticity decreases (c) Its plastic power decreases (d) Its plastic power increases EXPLANATION-B (243)
The Young’s modulus of a rubber string 8 cm long and density 1.5 kg/m3 is 5×108 N/m2 , is suspended on the ceiling in a room. The increase in length due to its own weight will be (a) 9.6×10-5 m …
(a) It will continue to move with velocity v along the original orbit of spacecraft (b) It will move with the same speed tangentially to the spacecraft (c) It will fall down to the earth gradually (d) It will go …
(a) 100% (b) 41.4% (c) 50% (d) 59.6% Answer: b (4)
(a) Oogamy (b) Anisogamy (c) Isogamy (d) Isogamy and oogamy both Ans. c (8)
(a) 1 kg m2 (b) 0.1 kg m2 (c) 2 kg m2 (d) 0.2 kg m2 Ans. b (11)
(a) It is a freely falling body (b) It suffers no acceleration (c) It is moving with a constant speed (d) Its angular momentum remains constant Answer: b (7)
(a) L = 500 cm, d = 0.05 mm (b) L = 200 cm, d = 0.02 mm (c) L = 300 cm, d = 0.03 mm (d) L = 400 cm, d = 0.01 mm Answer-d (11)
(a) A cylinder of same mass but of smaller radius (b) A cylinder of same mass but of larger radius (c) A cylinder of same radius but of smaller mass (d) A hollow cylinder of same mass and same radius …
(a) 1/4 (GMm /R) (b) 1/6 ( (GMm /R) (c) 2/3 (GMm /R) (d) 1/3 (GMm /R) Answer: b (42)
a. Si – O – Si linkage b. O – Si – O linkage c. Si – C – linkage d. Si – S – O linkage Ans. a (8)
24.To double the length of a iron wire having area of cross-section 0.5 cm2, the required force will be (Y=1012 dyne/cm2) (a) 1.0×10-7 N (b) …