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9571 quizzes
Assertion (A): A narrow beam of light of a single colour passes from air into a glass block. The frequency of the light in the glass is the same as its frequency in air. Reason (R): The speed of the light in the glass is smaller than its speed in air. New
High School (11–12) · Wave Optics
NEETAEEE (Amrita)AMUEEE+21
StemPy LabStemPy Lab
Advanced
A student compares the geometry of four pairs of species. In which pair do both species have the same geometry? New
High School (11–12) · Groups 17 and 18: Halogens and Noble Gases
JEE MainA-LevelIB+23A-LevelIB
StemPy LabStemPy Lab
Hard
The figure shows the number of cups of hot drinks sold by a cafe against the noon temperature on eight days. The line of best fit passes through the point of the means, (24, 50), and its slope is -2.5 cups for each degree. What number of cups does the line predict for a noon temperature of 30 °C? New
High School (11–12) · Statistics
JEE MainAPA-Level+26APA-LevelIB
StemPy LabStemPy Lab
Hard
A species of plant no longer lives in the wild, but a few plants live in a botanical garden. Which IUCN category fits it best? New
High School (11–12) · Biodiversity and Conservation
APA-LevelIB+16APA-LevelIB
StemPy LabStemPy Lab
Hard
A student types six expressions, one at a time, into a fresh Python session. Which of them give a value, instead of an error message? Choose every correct option.
High School (9–10) · Errors and Exceptions
PCEP (Python Institute)PCEP (Python Institute)
StemPy LabStemPy Lab
Hard
Which sentence is the best limit for a report on 20 winter days in one hill town?
Middle Stage (6–8), High School (9–10), High School (11–12), Undergraduate, General · Averages: Mean, Median and Mode
StemPy LabStemPy Lab
Easy
Unpolarised light of intensity I₀ falls on three polaroids P1, P2 and P3 in a row, all facing the beam as the figure shows. A polaroid passes only light polarised along its transmission axis. The transmission axes of P1, P2 and P3 make angles of 0°, 30° and 90° with the vertical. What is the intensity of the light that comes out of P3? New
High School (11–12) · Wave Optics
JEE MainNEETAEEE (Amrita)+22
StemPy LabStemPy Lab
Hard
A chemist passes 0.45 mol of chlorine into hot, concentrated sodium hydroxide. How many moles of sodium chlorate form? New
High School (11–12) · Groups 17 and 18: Halogens and Noble Gases
JEE MainA-LevelIB+23A-LevelIB
StemPy LabStemPy Lab
Hard
For a data set, the regression coefficient of y on x is -2 and the regression coefficient of x on y is -0.125. What is the correlation coefficient? New
High School (11–12) · Statistics
JEE MainAPA-Level+26APA-LevelIB
StemPy LabStemPy Lab
Hard
A state has 3 biosphere reserves, 6 national parks and 31 wildlife sanctuaries. What per cent of its protected areas of these three kinds are sanctuaries? New
High School (11–12) · Biodiversity and Conservation
APA-LevelIB+16APA-LevelIB
StemPy LabStemPy Lab
Hard
A loop prints a value in a try block. One item is the text "2", and only one kind of error is handled. What happens when the program runs?
High School (9–10) · Errors and Exceptions
PCEP (Python Institute)PCEP (Python Institute)
StemPy LabStemPy Lab
Advanced
A student writes: \"The mean highest temperature in the hill town was 12 °C, so every day was about 12 °C.\" What is wrong?
Middle Stage (6–8), High School (9–10), High School (11–12), Undergraduate, General · Averages: Mean, Median and Mode
StemPy LabStemPy Lab
Medium
Six statements about wavefronts and interference are given below. (i) Light from two sodium lamps gives a steady interference pattern. (ii) Coherent waves of intensity I₀ each give 4I₀ in phase. (iii) A point source at a lens focus gives plane wavefronts. (iv) A small part of a distant spherical wavefront is nearly plane. (v) A wavefront joins points that oscillate with a phase difference of π. (vi) A reflected plane wave obeys the law of reflection. How many of the statements above are correct? New
High School (11–12) · Wave Optics
NEETAEEE (Amrita)AMUEEE+21
StemPy LabStemPy Lab
Advanced
Why is the F-F bond weaker than the Cl-Cl bond although fluorine atoms are smaller? New
High School (11–12) · Groups 17 and 18: Halogens and Noble Gases
A-LevelIBAEEE (Amrita)+18A-LevelIB
StemPy LabStemPy Lab
Medium
A student finds that the correlation between two variables is 0.5 and says that the line explains 50% of the variation in y. A teacher says that this is wrong. What is the correct percentage? New
High School (11–12) · Statistics
APA-LevelIB+19APA-LevelIB
StemPy LabStemPy Lab
Medium
At which place and in which year was the Earth Summit held, which called on nations to conserve biodiversity? New
High School (11–12) · Biodiversity and Conservation
APA-LevelIB+14APA-LevelIB
StemPy LabStemPy Lab
Medium
A try statement has three except blocks, and the error fits more than one of them. What does the program print?
High School (9–10) · Errors and Exceptions
PCEP (Python Institute)PCEP (Python Institute)
StemPy LabStemPy Lab
Hard
In the hill town, the 3 snowy days had a mean highest temperature of 8.7 °C, and the other 17 days 12.5 °C. What may a report say?
Middle Stage (6–8), High School (9–10), High School (11–12), Undergraduate, General · Averages: Mean, Median and Mode
APIBAPIB
StemPy LabStemPy Lab
Medium
Two statements about interference of light from two narrow slits, lit by the same coherent monochromatic source, are given below. Statement I: With the screen where it is, moving the two slits closer together makes the fringes on the screen narrower. Statement II: At the dark fringes the energy of the two waves is destroyed, so the total energy reaching the screen is less than the sum of the two separate beams. New
High School (11–12) · Wave Optics
NEETAEEE (Amrita)AMUEEE+21
StemPy LabStemPy Lab
Hard
Four oxoacids of chlorine are compared by their strength in water. Which one is the strongest of the four? New
High School (11–12) · Groups 17 and 18: Halogens and Noble Gases
A-LevelIBAEEE (Amrita)+18A-LevelIB
StemPy LabStemPy Lab
Medium
A line of best fit was found from a data set in which x ran from 10 to 50. Which of these predictions is an interpolation? New
High School (11–12) · Statistics
APA-LevelIB+19APA-LevelIB
StemPy LabStemPy Lab
Medium
In a biosphere reserve, which zone has no human activity? New
High School (11–12) · Biodiversity and Conservation
APA-LevelIB+14APA-LevelIB
StemPy LabStemPy Lab
Medium
A loop adds a note to a list before a statement that can fail. Two except blocks add other notes. What does the program print?
High School (9–10) · Errors and Exceptions
PCEP (Python Institute)PCEP (Python Institute)
StemPy LabStemPy Lab
Hard
The chance of a snowy day is 0.15. If each day's weather did not depend on the day before, what would be the chance of two snowy days in a row?
Middle Stage (6–8), High School (9–10), High School (11–12), Undergraduate, General · Averages: Mean, Median and Mode
APIBAPIB
StemPy LabStemPy Lab
Hard
In a Young's double-slit experiment, light of wavelength 500 nm falls on slits 1.0 mm apart, with the screen 1.0 m away. Match each quantity with its value. List-I (Quantity) A. Fringe width in air B. Distance of the third bright fringe from the centre, in air C. Distance of the third dark fringe from the centre, in air D. Fringe width with the whole set-up in a liquid of index 1.25 List-II (Value) I. 0.40 mm II. 0.50 mm III. 1.25 mm IV. 1.5 mm New
High School (11–12) · Wave Optics
JEE MainNEETAEEE (Amrita)+22
StemPy LabStemPy Lab
Hard
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