The angle between two vectors  and  is

1.  cos-113

2.  cos-1-13

3.  sin-1-13

4.  90°

Subtopic:  Scalar Product |
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The distance x (in ) covered by a molecule starting from point A at time t = 0 and stopping at another point B in given by the equation The distance between A and B (in) is closed to

1.  10.7

2.  20.7

3.  40.7

4.  50.7

Subtopic:  Differentiation |
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A tangential force acting on the top of sphere of mass m kept on a rough horizontal place as shown in figure. 
 
If the sphere rolls without slipping, then the acceleration with which the centre of sphere moves, is

1.  10 F7 M

2.  F2 M

3.  3 F7 M

4.  7 F2 M

Subtopic:  Rolling Motion |
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The density of a rod having length l varies as , where x is the distance from the left end. The centre of mass is 

1.  3 cl+2Dl23 2 c+Dl

2.  3 cl+4Dl23 2 c+Dl

3.  2 cl+3Dl23 2 c+l

4.  cl+3Dl23 2 c+Dl

Subtopic:  Center of Mass |
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One end of a massless spring of constant 100 N/m and natural length 0.5m is fixed and the other end is connected to a particle of mass 0.5 kg lying on a frictionless horizontal table. The spring remains horizontal. If the mass is made to rotate at angular velocity of 2 rad/s, then elongation of spring is

1.  0.1m

2.  10 cm

3.  1 cm

4.  0.01 cm

Subtopic:  Uniform Circular Motion |
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A block slides down on an incline of angle 30 ° with an acceleration . Find the kinetic friction coefficient.

1.  122

2.  0.6

3.  123

4.  12

Subtopic:  Friction |
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Two long straight wires, each carrying an electric current of 5A, are kept parallel to each other at a separation of 2.5cm. Find the magnitude of the magnetic force experiment by 10cm of a wire.

1.  4.0 x 10-4N

2.  3.5 x10-6N

3.  2.0 X 10-5N

4.  2.0 x 10-9N

Subtopic:  Force between Current Carrying Wires |
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A wire of resistance 10Q is bent to form a complete circle. Find its resistance between two diametrically opposite point. 

1.  5Ω

2.  2.5Ω

3.  1.25Ω

3.  103Ω

Subtopic:  Combination of Resistors |
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Find the resistance of a hollow cylindrical Conductor with the inner and outer radii of length 1.0 mm and 2.0 mm respectively. The resistivity of the material is 2.0 x 10-8m. The length of the conductor is 10 m.

1.  2.1 x 10-3

2.  1.3 x 10-4

3.  3.2 x 10-4

4.  4.6 x 10-2

Subtopic:  Derivation of Ohm's Law |
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Three equal charges, each having a magnitude of 2.0 x 10-6C, are placed at the three corners of a right angled triangle of sides 3cm, 4cm and 5cm. The force (in magnitude) on the charge at the right angled corner is

1.  50 N

2.  26 N

3.  29 N

4.  45.9 N

Subtopic:  Coulomb's Law |
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