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Class 11th

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2 months ago

Class 11th Chemistry

Incorrectly matched among the following is:

 
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A
alok kumar singh

Contributor-Level 10

Yield of 4-hydroxypentan-2-one is low because aldol and diacetone alcohol are also formed.

New answer posted

2 months ago

Class 11th Physics System of Particles and Rotational Motion

The torque τ ? acts on a body about a given point is found to be equal to A ? * L ? where A ? is a constant nonzero vector and L ? is the angular momentum of the body about that point. Choose the incorrect option: ( A ? ≠ ± L ˆ )

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R
Raj Pandey

Contributor-Level 9

τ ? = d L ? d t = A ? * L ? ⇒ d L ? d t ⊥ L ?

∴ Statement (1) is correct

 

The component of L ?  in the direction of A ?  is always perpendicular to  , so it does not change.

∴  Statement (2) is correct

The magnitude of L ?  does not change with time as τ ? ⊥ L ?  .

∴  Statement (3) is correct

The direction of  L ? changes with time.

∴ Statement (4) is incorrect.

New answer posted

2 months ago

Class 11th Structure of Atom

Out of the following, which is the correct match for radial probability of finding the electron of 2s orbital?

 
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A
alok kumar singh

Contributor-Level 10

  r = r 0 n 2 Z

As Z increases, r0 decreases

Hence upon increasing Z, nuclear distance of node decreases.

New answer posted

2 months ago

Class 11th Chemistry Classification of Elements and Periodicity in Properties

Which of the following ionic species has maximum ionization energy?
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A
alok kumar singh

Contributor-Level 10

  Δ H e g ( M ) = I E ( M − )  

M + e − ? I E Δ H e g M −            

Since sulphar has most -ve electron gain enthalpy hence S- will have the highest IE.

New answer posted

2 months ago

Class 11th Physics

A particle of mass 3 kg moving with speed of 3 m/s is acted upon by an impulse. As a result, the particle starts moving in a direction 90° to the original direction with a speed of 4 m/s. Find the impulse acted upon on the particle in SI units.
0 Follower 2 Views

V
Vishal Baghel

Contributor-Level 10

I? = P? – P? = 3 * 4? – 3 * 3î = 12? – 9î |I? | = √12² + 9² = 15kgm/s

New answer posted

2 months ago

Class 11th Waves

Speed of sound in a resonance tube experiment is given by the expression v = 2f0(l2 – l1) where f? is the frequency of the tuning fork and l1, l2 are length of the air column. Consider f0 = 300 Hz with no error in its value. Lengths of the air column l1 and l2 are measured as 25.0 cm and 80.0 cm respectively. Find the absolute error in the speed of sound (in m/s).
0 Follower 3 Views

V
Vishal Baghel

Contributor-Level 10

Δν = 2f? (Δl? + Δl? ) = 2 * 300 (0.1 + 0.1) * 10? ² = 1.2 m/s

New answer posted

2 months ago

Class 11th Physics

A wooden wheel having radius of 1 m is to be fitted with an iron ring around it. The diameter of the ring is 6 mm smaller than the wooden wheel. If the coefficient of linear expansion of iron is 1.2 * 10-5/ °C, then find the minimum increase in temperature (in °C) to fit the ring on the wheel.
0 Follower 2 Views

V
Vishal Baghel

Contributor-Level 10

r = r? (1 + αΔT) ⇒ r – r? = r? αΔT
⇒ 3 * 10? ³ = 1 * 1.2 * 10? ΔT ⇒ ΔT = 250°C

New answer posted

2 months ago

Class 11th Physics Mechanical Properties of Fluids

A bucket of height 20 cm is placed under a tap such that water flows into the bucket at a constant rate of 100 cm3/s. There is a small hole in the bucket of cross-sectional area of 1 cm2 at height of 3 cm from the bottom. Area of hole is very small as compared to area of the bucket. Find the maximum height (in cm ) above the bottom upto which the water is filled in the bucket. (Take g = 10 m/s2 )
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V
Vishal Baghel

Contributor-Level 10

Q = a√2gh
h = Q²/ (a² * 2g) = (10? )²/ (10? * 2 * 10) = 5 cm
Height above the ground = 3 cm + 5 cm = 8 cm

New answer posted

2 months ago

Class 11th Thermodynamics

12gm of gas occupy a volume of 4 * 10-3 m3 at a temperature of 7°C. After the gas is heated at constant pressure its density becomes 6 * 10-4gm/cm3. What is the temperature to which the gas was heated (in kelvin)?
0 Follower 2 Views

V
Vishal Baghel

Contributor-Level 10

P = (RT/M? )ρ ⇒ P/ρT = constant
⇒ (12)/ (4 * 10? ³ * 10? ) * 280 = 6 * 10? * T ⇒ T = 1400K

New question posted

2 months ago

Class 11th Physics Oscillations

A rod is clamped at both of its ends and stationary longitudinal waves are produced in it. In first experiment, the rod has a total of 4 nodes with amplitude of each anti-node to be 1mm. In other experiment, the rod has a total of 6 nodes with amplitude of each anti node to be 2mm. The energy of vibrations in the rod in two case is E1 and E2 respectively. Write value of  
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