A spring scale reads 20. newtons as it pulls a 5.0-kilogram mass across a table. What is the magnitude of the force exerted by the mass on the spring scale?

1) 49 N
2) 20. N
3) 5.0 N
4) 4.0 N

In which of the following heat loss is primarily not due to convection.

 A car travels at 30 m/s. Seeing the cars in front of it begin to brake, it brakes and experiences an acceleration of –2 m/s² for 4 seconds. What is its final speed?

1) 28 m/s

2) 14 m/s

3) 2 m/s

4) 22 m/s

A bus moving on a level road with a velocity $$V$$ can be stopped at a distance of $$x$$, by the application of a retarding force $$F$$. The load on the bus is increased by $$25\%$$ by boarding the passengers. Now, if the bus is moving with the same speed and if the same retarding force is applied, the distance travelled by the bus before it stops is:

1) x
2) 1.25x
3) 5x
4) 2.5x

A bob is suspended from a crane by a cable of length l = 5m. The crane and load are moving at a constant speed v. the crane is stopped by a bumper and the bob on the cable swings out an angle of 60°. The initial speed v is ( g=9.8 m/s²)

1) 10 m/s
2) 7 m/s
3) 4 m/s
4) 2 m/s

The maximum speed at which a car can turn around a curve of 30 m radius on a level road if the coefficient of friction between the tyres and the road being 0.4 is:
1. 10.84 m/s
2.11.32 m/s
3. 10.26 m/s
4.9.86 m/s

In a good conductor the energy gap between the conduction band and valence band is:

(1) Wide
(2) Infinite
(3) Zero
(4) Narrow

Block of mass 4 kg rests on a rough inclined plane making an angle of 30 with the horizontal. The coefficient of static friction between the block and the plane is 0.7. The friction force on the block is:
1. 9.8 N
2. 13.5 N
3. 16.8 N
4.19.6 N

The energy of gamma ($$\gamma$$) ray photon is $$E_y$$ and that of an X-ray photon is $$E_x$$. If the visible light photon has an energy of $$E_v$$, then we can say that

1) $$E_x > E_y > E_v$$
2) $$E_y > E_v > E_x$$
3) $$E_y > E_x > E_v$$
4) $$E_x > E_v > E_y$$

A rod of 10cm length is moving perpendicular to uniform magnetic field of intensity 5×10⁻⁴Wb/m². If the acceleration of the rod is 5m/s² then the rate of increase of induced emf is

1) 2.5 × 10⁻⁴Vs⁻¹
2) 25 × 10⁻⁴Vs
3) 20 × 10⁻⁴Vs
4) 20 × 10⁻⁴Vs⁻¹