Q.1
A beaker contain water is placed on a scale balance which indicates a mass of 0.5kg. A glass sphere of mass 0.2kg is suspended from a string and immersed in water such that it does not touch the beaker. If the relative density of glass is 2.5, then the reading on the balance will change to [ SCRA 1994]
  • a) 0.62 kg
  • b) 0.58 kg
  • c) 0.50kg
  • d) 0.42 kg
Q.2
When a force is applied on a wire of uniform cross-sectional area 3×10⁻⁶ m2 and length 4m, the increase in length is 1mm. Energy stored in it will be [ Y=2×1011 N/m2] [ MP PET 1995]
  • a) 6250 Joule
  • b) 0.177 Joule
  • c)0.075 Joule
  • d)0.150 Joule
Q.3
A material has Poisson's ratio 0.if a uniform rod of it suffers a longitudinal strain of 2×10⁻³, then the percentage change in volume is [ AP1987]
  • a) 0.6
  • b) 0.4
  • c)0.2
  • d)zero
Q.4
The compressibility of water is 4×10⁻⁵ per unit atmospheric pressure. The decrease in volume of 100cm3 of water under a pressure of 100 atmospheres will be [ MPPMT 1990]
  • a) 0.4 cm3
  • c)0.025 cm3
  • d)0.04 cm3
  • b) 4×10⁻⁵ cm³
Q.5
When a 4 kg mass is hung vertically on a light spring that obeys Hook's law, the spring stretches by 2cm. The work required to be done by an external agent in stretching this spring by 5cm will be ( g=9.8 m/s2[ PMT 1995]
  • a)4.900 Joule
  • b) 2.450 Joule
  • c)0.495 Joule
  • d)0.245 Joule
Q.6
A body of mass 10 kg is attached to a wire 30 cm long. It breaking stress is 4.8 ×107 Nm-The area of cross-section of the wire is 10-6 mWhat is the maximum angular velocity with which it can be rotated in horizontal circle [ CPMT 1998]
  • a) 1 rad/s
  • b) 2 rad/s
  • c)4 rad/s
  • d)8/rad/s
Q.7
The work in splitting a drop of water of 1mm radius into 106 droplets is ( surface tension of water=72×10⁻³ J /m2 ) [ MPPMT 1994]
  • a)9.98×10⁻⁵ Joule
  • b) 8.95×10⁻⁵ Joule
  • c)5.89×10⁻⁵ Joule
  • d)5.98×10⁻⁵ Joule
Q.8
Water rises in a capillary tube to a certain height such that the upward force due to surface tension is balanced by 75×10⁻⁴N force due to the weight of the liquid. If the surface tension of water is 6×10⁻²Nm-1, the inner circumference of the capillary must be [ CPMT 1988]
  • d)12.5×10⁻²
  • a) 1.25×10⁻² m
  • b) 0.50 ×10⁻² m
  • c)6.5×10⁻² m
Q.9
The clouds float in the atmosphere because of
  • a) their low temperature
  • b) their low viscosity
  • c) their low density
  • d) creation of low pressure
Q.10
A thin square steel plate with each side equal to 10cm is heated by a blacksmith. The rate of radiated energy by the heated plate is 1134 watts. The temperature of the hot steel plate is... ( stefan's constant σ = 5.67×10⁻⁸ watt meter-2 K-4, emissivity of the late = 1 ) [ PMT 1995]
  • a) 1000 K
  • b) 1189 K
  • c) 2000 K
  • d) 2378 K
Q.11
A pendulum of brass has period of 1 sec. at 20°C. Coefficient of linear expansion of brass is 1.93×10⁻⁵ / °C. The clock gets delayed in week at 30° by ..[ Raj.PET 1997]
  • a) 8 sec
  • b) 58s
  • c) 224 s
  • d) 504 s
Q.12
A rod of length 30 cm made of material A expands by 0.075 when its temperature is raised from 0°C to 100 °C. Another rod of a different metal B having same length expands by 0.045cm, for the same change in temperature. A third rod of the same length is composed of two parts, one of metal A and other of metal B. This rod expands by 0.065 cm, for the same change in temperature. The portion made of metal A has the length [ CPMT 1991]
  • a) 20 cm
  • b) 10 cm
  • c) 15 cm
  • d) 18 cm
Q.13
A heat flux of 4000 J/s is to be passed through a copper rod of length of 10cm and area of cross section 100 sq. cm. The thermal conductivity of copper is 400 W/m. °C. The two ends of this rod must be kept at a temperature difference of [ MPPMT 1999]
  • a) 1°C
  • b) 10°C
  • c)100 °C
  • d)1000 °C
Q.14
A rectangular film of liquid is extended from(4 cm × 2 cm) to (5 cm × 4 cm). If the work doneis 3 × 10⁻⁴ J, the value of the surface tension of theliquid is [NEET II – 2016]
  • a) 0.2 Nm–1
  • b) 8.0 Nm–1
  • c) 0.250 Nm–1
  • d) 0.125 Nm–1
Q.15
A jar is filled with two non-mixing liquids 1 and 2 having densities ρ1 and ρ2 respectively. A solid ball, made of a material of density ρ3, is dropped in the jar. It comes to equilibrium in the position shown in figure. Which of the following is true for ρ1 , ρ2 ,ρ3? [ AIEEE 2008]
  • a)ρ3 < ρ1 < ρ2
  • b) ρ1 > ρ3 >ρ2
  • c)ρ1 < ρ2 < ρ3
  • d)ρ1 < ρ3 < ρ2
0 h : 0 m : 1 s