Questions by Doubtly

0 votes

1 answer 201 views

5 books and 7 pens together cost Rs 79 whereas 7 books and 5 pens together cost Rs 77, find the total cost of 1 book and 2 pens.

asked May 26, 2021 in hots

+1 vote

1 answer 661 views

Shabana’s age 10 year hence will be twice as Juhi’s present age.

asked May 26, 2021 in hots

0 votes

1 answer 190 views

Uncertainty in position of a particle of 25 g in space is 10–5 m. Hence, uncertainty in velocity (m s–1) is (Planck’s constant, h = 6.6 × 10–34 Js)

asked May 25, 2021 in random

0 votes

0 answers 154 views

In a hydrogen atom, if the energy of an electron in the ground state is – 13.6 eV, then that in the 2nd excited state is

asked May 25, 2021 in random

0 votes

1 answer 158 views

Which of the following ions has the maximum magnetic moment ?

asked May 25, 2021 in random

0 votes

1 answer 198 views

Energy of H-atom in the ground state is –13.6 eV, hence energy in the second excited state is

asked May 25, 2021 in random

0 votes

1 answer 449 views

a.When the gas formed on heating limestone is passed through freshly prepared lime water, the lime water turns milky

asked May 23, 2021 in Chapter 3: Chemical reactions and equations

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1 answer 163 views

d. Displacement reaction 3. Explain the following terms with examples.

asked May 23, 2021 in Chapter 3: Chemical reactions and equations

0 votes

1 answer 285 views

c. Balanced equation 3. Explain the following terms with examples.

asked May 23, 2021 in Chapter 3: Chemical reactions and equations

0 votes

1 answer 129 views

b. Combination reaction 3. Explain the following terms with examples.

asked May 23, 2021 in Chapter 3: Chemical reactions and equations

0 votes

1 answer 206 views

There is a stream of neutrons with the kinetic energy of 0.0327 eV.

asked May 22, 2021 in Physics

0 votes

1 answer 175 views

There is a stream of neutrons with a kinetic energy of 0.0327 eV.

asked May 22, 2021 in Physics

0 votes

1 answer 2.3k views

A big dumb-bell is prepared by using a uniform rod of mass 60 g and length 20 cm. Two identical solid spheres of mass 50 g

asked May 22, 2021 in Chapter1:Rotational Dynamics

0 votes

1 answer 364 views

Convert the following decimal number into binary

asked May 21, 2021 in number system

0 votes

1 answer 555 views

A flywheel used to prepare earthenware pots is set into rotation at 100 rpm. It is in the form of a disc

asked May 19, 2021 in Chapter1:Rotational Dynamics

0 votes

1 answer 560 views

The road in the question 14 above is constructed as per the requirements.

asked May 19, 2021 in Chapter1:Rotational Dynamics

0 votes

1 answer 361 views

A metallic ring of mass 1 kg has moment of inertia 1 kg m2 when rotating about one of its diameters

asked May 19, 2021 in Chapter1:Rotational Dynamics

0 votes

1 answer 1.8k views

State and explain the principle of conservation of angular momentum. Use a suitable illustration. Do we use it in our daily life? When?

asked May 19, 2021 in Chapter1:Rotational Dynamics

+1 vote

1 answer 2.7k views

Derive an expression that relates angular momentum with the angular velocity of a rigid body.

asked May 18, 2021 in Chapter1:Rotational Dynamics

0 votes

1 answer 986 views

State the conditions under which the theorems of parallel axes and perpendicular axes are applicable.

asked May 18, 2021 in Chapter1:Rotational Dynamics