Practice Test - NEET MCQ

The y coordinates of the particles of the body may be all non zero and positive for some cases and negative in other cases.

Since the points must have symmetric coordinates so B is the answer.

1. It can’t be since the integral would yield a value much greater than R/2
2. It can’t be since the integral would yield a value much less than R/2
3. Assuming the rate of increase and decrease is same the COM could lie in the centre
4. Assuming the rate of increase and decrease is same the COM could lie in the centre
    

Equation of SHM particle: 
Y=a sinωt
V=aω sinωt
V_max = aω
So the velocity is maximum at mean position

Periodic time is the time taken for one complete revolution of the particle.

∴ Periodic time (t_p) = 2 π/ω seconds.

Frequency is defined as time taken to perform one oscillation by the object.

Hence, 1Hz corresponds to 1 vibration per sec.

Molality = moles of solute / kg of solvent.

1 ppm is equivalent to 1 part out of 1 million (10⁶) parts.
∴ Mass percent of 15 ppm chloroform in water 

⇒ 1.5 x 10^-3 g chloroform present in 100 g water
Thus, 15g chloroform will be present in water 

Molecular mass of glycerine = 92 g
Molecular mass of water = 18 g

No. of moles of glycerine = 46/92 = 0.5 moles
No. of moles of water = 36/18 = 2 moles

Thus, Mole fraction of glycerine = No. of moles of glycerine/(No. of moles of glycerine + No. of moles of water) = 0.5/(2 + 0.5)  = 0.20

12.5% w/w means 12.5 g in 100 g of solution.

Weight of solvent = 100 g – 12.5 g = 87.5 g.
Number of moles of sulphuric acid = 12.5/ 98 = 0.127 mol

⇒ molality = 0.127 x 1000/87.5 = 1.45 m

When both the solute and solvent are in solid state, then the solution is called a solid solution or solid sol.

Solid Sol includes gems, photochromic glass, alloys, ruby stone, coloured glass, vision glasses, etc.

In 3M there will be 3 moles per litre therefore in 3 litres there will be 9 moles.

All living organisms are composed of cells and products of cells.all cells arise from pre-existing cells.

The shapes of bacteria are bacillus (rod like), coccus (spherical), vibrio (comma shaped) and spirillum (spiral).

Mitochondria are double membranous structure. The inner membrane of mitochondria thrown into folds to form finger-like structureis called cristae.

Rudolf Virchow(1855) first explained that cells divided and new cells are formed .

Ribosomes are granules formed of rRNA and protein. Ribosome provide space for protein synthesis during translation.

Anton Von Leeuwenhoek first saw and described a live cell.

Reserve material in prokaryotic cells are stored in the cytoplasm in the form of inclusion bodies.

The staining procedure developed by Gram viz., those that take up the gram stain are gram positiveand the others that do not are called gram negative bacteria.

The cytoskeleton of a cell is made up of microtubules, actin filaments,and intermediate filaments. These structures give the cell its shape and help organize the cell’s parts. They also provide a basis for movement and cell division

Smooth endoplasmic reticulum (SER) differ from rough endoplasmic reticulum (RER) in absence of ribosome on the surface of endoplasmic reticulum.

Mitochondria are the sites of aerobic respiration. They producecellular energy in the form of ATP

Mitochondria is the largest cell organelles in animal cell and chloroplast is the largest cell organelles in plant cell.

Mitochondria contain cristae, finger like projection of inner layer, thylakoid is present in chloroplast and lysosome is a digestive enzyme but RNA is absent in Chromosome.

Lysosomes are single membrane structures containing enzymes for digestion of all types of macromolecules.

A cell membrane shows fluid behavior due to mosaic of lipid and proteins. Fluid mosaic model of plasma membrane is most accepted and recent model.

Mitochondria are present in both plant as well as animal cells. Plastids and central vacuoles are present in plant cells and centrioles are present in only animal cells.