"The man who moves a mountain begins by carrying away small stones."
প্রতিটি প্রশ্নের জন্য চারটি করে উত্তর থাকবে যার একটি সঠিক, বামদিকে A, B, C এবং D এর উপর ক্লিক করে সঠিক উত্তরটি দেখতে পারেন। যদি উত্তর সঠিক হয় তবে অপশনটির ডান দিকে টিক (✔) আর উত্তর ভূল হলে ক্রস (✖) চিনহ প্রদ্ররশিত হবে।
#: 21. Of the following statements of a bar magnet, which one is wrong?
Magnetism at the centre of a bar magnet is maximum.
Every magnet has both a North and a South pole.
If you were to put two north poles together, they would repel.
But a north and a south would stick together.
#: 22. Type of force that opposes motion and releases thermal energy, what is it called?
#: 23. When there are no external forces, the shape of a liquid drop is determined by.
Temperature of air only
Surface tension of the liquid
Density of liquid
Viscosity of liquid
#: 24. Choose the wrong statement from the following
Energy transforms from one form to another.
Density is defined as mass per unit volume.
Energy can neither be created nor destroyed
Newton's first law is: For every action, there is an equal and opposite reaction.
#: 25. Which of the following is not based one the principle of capillarity?
Ploughing of soil
Rise of oil in wick of lantern
Floating of wood on eater surface
Soaking of ink by bloating paper
#: 26. The weight of an object is a/an.
#: 27. If there is an object of 30 grams and another object of 90 grams. total mass equal to-
#: 28. what does Lux mean?
Lux is the SI unit of intensity of illumination
Lux is the SI unit of iluminous intensity
Lux is the SI unit of luminous efficiency
Lux is the SI unit of luminous flux
#: 29. A box full of bricks weighs 100 N on moon and has a mass of 66 kg. gravitational pull of moon is
#: 30. On a rainy day, small oil films on water show brilliant colours. This is due to.