AP EAMCET-2019- EAMCET-2019-Engineering-20 Apr-Shift-1 Physics

AP EAMCET-2019-

 EAMCET-2019-Engineering-20 Apr-Shift-1 

      Physics 

81. If the charge of electron 'e', mass of electron 'm', speed of light in vacuum is 'c' and Planck's constant 'h' are taken as fundamental quantities, then the permeability of vacuum u, can be expressed as h

1) h/mc²

2) hc/me² 

3) h/ce²  

4) mc²/he²

82. The velocity of an object moving in a straight line path is given as a function of time by v= 6t – 3t, where v is in ms', t is in s. The average velocity of the object between t 0 and t = 2 seconds is

1) 0 ms⁻¹

2) 3 ms⁻¹

3) 2 ms⁻¹

4) 4.ms⁻¹

83. A gun and a target are at the same horizontal level separated by a distance of 600 m. The bullet is fired from the gun with a velocity of 500 ms'. In order to hit the target, the gun should be aimed to a height h above the target. The value of h is (Acceleration due to gravity = 10 ms) 

1) 2.4 m 

2) 3.6 m 

3) 7.2 m 

4) 10.8 m

 84. A projectile is thrown in the upward direction making an angle of 60° with the horizontal with a velocity of 140 ms'. Then, the time after which its velocity makes 45° with the horizontal is (Acceleration due to gravity = 10 ms ) 

1) 0.5124 s 

2) 51.24 s 

3) 5.124 s  

4) 512.4 s 

85. The maximum value of the applied force F such that the block as shown in the arrangement does not move is (Acceleration due to gravity 10 ms) 

1) 20 N 

2) 15 N 

3) 25 N 

4) 10 N 

86. A rough inclined plane BCE of height 25/6  m is kept on a rectangular wooden block ABCD of height 10 m, as shown in the figure. A small block is allowed to slide down from the top E of the inclined plane. The coefficient of kinetic friction between the block and the  inclined plane is 1/8 and the angle of inclination of the inclined plane is sin⁻¹(0.6). If the small block finally reaches the ground at point F. then DF = (Acceleration due to gravity =10 ms⁻²)

1)5/3 m

2)10/3 m

3)13/3 m

4)20/3 m

 87. Two particles P and Q each of mass 3m lie at rest on the X-axis at points (-a,0) and (+a,0) respectively. A third particle R of mass 2m initially at the origin moves towards particle Q. If all the collisions of the system of 3 particles are elastic and head-on the total number of collisions in the system is

1) 2 

2) 3 

3) 4 

4) 5 

88. A motor engine pumps 1800 litre of water per minute from a well of depth 30 m and allows to pass through a pipe of cross sectional area 30 cm². Then the power of the engine is (Acceleration due to gravity =10 ms⁻² )

1) 20.5 kW 

2) 15.5 kW 

3) 10.5 kW 

4) 9.5 kW

89. A solid sphere of mass 100 kg and radius 10 m moving in a space becomes a circular disc of radius 20 m in one hour. Then the rate of change of moment of inertia in the process is  

1) 40/9 kg m² s⁻¹

2) 10/9 kg m²s⁻¹ 

3)50/9 kg m² s⁻¹ 

4)25/9 kg m² s⁻¹ 

90. A semicircular plate of mass 'm' has radius r' and centre c'. The centre of mass of the plate is at a distance 'x from its centre 'c'. Its moment of inertia about an axis passing through its centre of mass and perpendicular to its plane is mr? 

1) mr²/2 

2) mr²/4

3)  mr²/2 + mx²

4) mr²/2 - mx² 

91. Two bodies of masses mį. and m2 initially at rest at infinite distance apart move towards each other under gravitational force of attraction. Their relative velocity of approach when they are separated by a distance 'r' is (G-Universal gravitational constant) 2G(m, - m,) (1) 1/2 2G(m, + m,) (2) 1/2 (3) 2G(mm 2G (4) 1/2 u'u- 92. A planet is revolving around the sun as shown in the figure. The radius vectors joining the sun and the planet at points A and B are 90x10° km and 60x10 kmrespectively. The ratio of