A body in a room cools from 90°C to 80°C in 5 minutes. The time taken to cool from 70°C to 60°C is?
- Less than 5 minute
- 5 minute
- More than 5 minute
- Less or more than 5 minutes depending upon the nature of the body
Which of the following is not a property of solids?
- The solids have a high density in comparison to gasses
- Solids have definite shape
- Solids have an indefinite volume, not easily compressed
- Solids have relatively strong intermolecular force
The repulsive energy is always?
- Negative
- Positive
- Could be either positive or negative depending on the conditions
- None of these
Repeatable entity of a crystal structure is known as?
- Crystal
- Lattice
- Unit cell
- Miller indices
In a simple model, the unforced rising of hot air can be attributed to?
- Orographic lifting
- The low specific heat of air
- Buoyancy
- Steam rising
A disc of mass 2 kg and diameter 2m is performing rotational motion. Find the work done, if the disc is rotating from 300 rpm to 600 rpm?
- 1479 J
- 14.79 J
- 147.9 J
- 1.479 J
The mean free path of nitrogen molecules at 27°C is 3 x 10^-7 m/s. If the average speed of nitrogen molecules at the same temperature is 600 m/s then the collision frequency will be?
- 10^-9/sec
- 1.5 x 10^-9/sec
- 2 x 10^-9/sec
- 3 x 10^-9/sec
The average translational K.E. of the molecules in a sample of oxygen at 300K is 6 x 10-20. What is the average translational energy at 750 K?
- 2 x 10^-19 J
- 1.5 x 10^-19 J
- 3.5 x 10^-18 J
- 3.5 x 10^-21 J
x → Ni 6528 + y. Identify the missing nuclide in gamma decay.
- O178
- Po21584
- Fe5522
- Ni6528
Also Read: SPSC Past Papers MCQs
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