Physics Test 166

Result

Physics Test 166

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Weekly Quiz Competition

Question 1
4 / -1

If Q denote the charge on the plate of a capacitor of capacitance C then the dimensional formula for is

A

B

C

D

Solution
Question 2
4 / -1

Two cars are moving in the same direction with the same speed 30 km/hr. They are separated by a distance of 5 km. The speed of a car moving in the opposite direction if it meets these two cars at an interval of 4 minutes, will be

A
40 km/hr

B
45 km/hr

C
30 km/hr

D
15 km/hr

Solution
Question 3
4 / -1

A projectile is fired at an angle of 45° with the horizontal. Elevation angle of the projectile at its highest point as seen from the point of projection is

A
60°

B

C

D
45°

Solution
Question 4
4 / -1

Two blocks are connected over a massless pulley as shown in fig. The mass of block A is 10 kg and the coefficient of kinetic friction is 0.2. Block A slides down the incline at constant speed. The mass of block B in kg is

A
3.5

B
3.3

C
3.0

D
2.5

Solution
Question 5
4 / -1

A car of mass m starts from rest and accelerates so that the instantaneous power delivered to the car has a constant magnitude P0. The instantaneous velocity of this car is proportional to:

A

B

C

D

Solution
Question 6
4 / -1

A solid sphere of mass M and radius R is pulled horizontally on a sufficiently rough surface as shown in the figure. Choose the correct alternative.

A
The acceleration of the centre of mass is F/M

B
The acceleration of the centre of mass is

C
The friction force on the sphere acts forward

D
The magnitude of the friction force is F/3
Question 7
4 / -1

Two identical geostationary satellites are moving with equal speeds in the same orbit but their sense of rotation brings them on a collision course. The debris will

A
fall down

B
move up

C
begin to move from east to west in the same orbit

D
begin to move from west to east in the same orbit

Solution

The total momentum will be zero and hence velocity will be zero just after collision. The pull of earth will make it fall down.
Question 8
4 / -1

A circular tube of mean radius 8 cm and thickness 0.04 cm is melted up and recast into a solid rod of the same length. The ratio of the torsional rigidities of the circular tube and the solid rod is

A

B

C

D

Solution
Question 9
4 / -1

What is the velocity v of a metallic ball of radius r falling in a tank of liquid at the instant when its acceleration is one-half that of a freely falling body? (The densities of metal and of liquid are and respectively, and the viscosity of the liquid is ).

A

B

C

D
Question 10
4 / -1

The top of an insulated cylindrical container is covered by a disc having emissivity 0.6 and conductivity 0.167 WK–1m–1 and thickness 1 cm. The temperature is maintained by circulating oil as shown in figure. Find the radiation loss to the surrounding in if temperature of the upper surface of the disc is 27°C and temperature of the surrounding is 27°C.

A

B

C

D

Solution